Update vendor/libarchive to 3.8.5vendor/libarchive

Important bugfixes:
 #2809 bsdtar: fix regression from 3.8.4 zero-length pattern issue bugfix

Obtained from:	libarchive
Vendor commit:	dd897a78c662a2c7a003e7ec158cea7909557bee

52 files changed, 2891 insertions, 30 deletions

diff --git a/contrib/android/Android.mk b/contrib/android/Android.mk
index 2e9d9a399ad8..20e46a699643 100644
--- a/contrib/android/Android.mk
+++ b/contrib/android/Android.mk
@@ -26,6 +26,8 @@ LOCAL_PATH := $(subst /contrib/android,,$(call my-dir))
 libarchive_target_config := contrib/android/config/android.h
 
 libarchive_src_files := libarchive/archive_acl.c \
+						libarchive/archive_blake2s_ref.c \
+						libarchive/archive_blake2sp_ref.c \
 						libarchive/archive_check_magic.c \
 						libarchive/archive_cmdline.c \
 						libarchive/archive_cryptor.c \
@@ -44,6 +46,7 @@ libarchive_src_files := libarchive/archive_acl.c \
 						libarchive/archive_parse_date.c \
 						libarchive/archive_pathmatch.c \
 						libarchive/archive_ppmd7.c \
+						libarchive/archive_ppmd8.c \
 						libarchive/archive_random.c \
 						libarchive/archive_rb.c \
 						libarchive/archive_read.c \
@@ -86,6 +89,7 @@ libarchive_src_files := libarchive/archive_acl.c \
 						libarchive/archive_read_support_format_lha.c \
 						libarchive/archive_read_support_format_mtree.c \
 						libarchive/archive_read_support_format_rar.c \
+						libarchive/archive_read_support_format_rar5.c \
 						libarchive/archive_read_support_format_raw.c \
 						libarchive/archive_read_support_format_tar.c \
 						libarchive/archive_read_support_format_warc.c \
@@ -93,6 +97,7 @@ libarchive_src_files := libarchive/archive_acl.c \
 						libarchive/archive_read_support_format_zip.c \
 						libarchive/archive_string.c \
 						libarchive/archive_string_sprintf.c \
+						libarchive/archive_time.c \
 						libarchive/archive_util.c \
 						libarchive/archive_version_details.c \
 						libarchive/archive_virtual.c \
@@ -123,7 +128,9 @@ libarchive_src_files := libarchive/archive_acl.c \
 						libarchive/archive_write_set_format_ar.c \
 						libarchive/archive_write_set_format_by_name.c \
 						libarchive/archive_write_set_format_cpio.c \
+						libarchive/archive_write_set_format_cpio_binary.c \
 						libarchive/archive_write_set_format_cpio_newc.c \
+						libarchive/archive_write_set_format_cpio_odc.c \
 						libarchive/archive_write_set_format_iso9660.c \
 						libarchive/archive_write_set_format_mtree.c \
 						libarchive/archive_write_set_format_pax.c \
@@ -305,4 +312,17 @@ LOCAL_SRC_FILES := $(bsdcat_src_files)
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/libarchive $(LOCAL_PATH)/libarchive_fe $(LOCAL_PATH)/contrib/android/include
 include $(BUILD_EXECUTABLE)
 
+include $(CLEAR_VARS)
+LOCAL_MODULE := bsdtar-recovery
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_STEM := bsdtar
+LOCAL_CFLAGS :=  -DBSDTAR_VERSION_STRING=ARCHIVE_VERSION_ONLY_STRING -DPLATFORM_CONFIG_H=\"$(libarchive_target_config)\"
+LOCAL_STATIC_LIBRARIES := libarchive libarchive_fe libz
+LOCAL_SRC_FILES := $(bsdtar_src_files)
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/libarchive $(LOCAL_PATH)/libarchive_fe $(LOCAL_PATH)/contrib/android/include
+LOCAL_MODULE_CLASS := RECOVERY_EXECUTABLES
+LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/sbin
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+include $(BUILD_EXECUTABLE)
+
 endif
diff --git a/contrib/android/config/android.h b/contrib/android/config/android.h
index 0a273be235b7..3fd6806d5f1c 100644
--- a/contrib/android/config/android.h
+++ b/contrib/android/config/android.h
@@ -26,6 +26,8 @@
 #ifndef ARCHIVE_PLATFORM_H_ANDROID_INCLUDED
 #define	ARCHIVE_PLATFORM_H_ANDROID_INCLUDED
 
+#define __LIBARCHIVE_CONFIG_H_INCLUDED 1
+
 #include <android/api-level.h>
 #ifdef __ANDROID_API__
 #if __ANDROID_API__ > 20
@@ -40,8 +42,8 @@
 
 #define HAVE_CHOWN 1
 #define HAVE_CHROOT 1
-#define HAVE_CLOSEFROM 1
-#define HAVE_CLOSE_RANGE 1
+#define HAVE_CLOSEFROM 0
+#define HAVE_CLOSE_RANGE 0
 #define HAVE_CTIME_R 1
 #define HAVE_CTYPE_H 1
 #define HAVE_DECL_EXTATTR_NAMESPACE_USER 0
@@ -55,6 +57,8 @@
 #define HAVE_DECL_UINTMAX_MAX 1
 #define HAVE_DECL_UINT32_MAX 1
 #define HAVE_DECL_UINT64_MAX 1
+#define HAVE_DECL_INT32_MAX 1
+#define HAVE_DECL_INT32_MIN 1
 #define HAVE_DIRENT_H 1
 #define HAVE_DIRFD 1
 #define HAVE_DLFCN_H 1
@@ -137,7 +141,7 @@
 #define HAVE_STRING_H 1
 #define HAVE_STRRCHR 1
 #define HAVE_STRUCT_STAT_ST_BLKSIZE 1
-#define HAVE_STRUCT_STAT_ST_MTIME_NSEC 1
+#define HAVE_STRUCT_STAT_ST_MTIME_NSEC 0
 #define HAVE_STRUCT_TM_TM_GMTOFF 1
 #define HAVE_SYMLINK 1
 #define HAVE_SYS_CDEFS_H 1
diff --git a/contrib/oss-fuzz/fuzz_helpers.h b/contrib/oss-fuzz/fuzz_helpers.h
new file mode 100644
index 000000000000..bbdfdaf3a4fd
--- /dev/null
+++ b/contrib/oss-fuzz/fuzz_helpers.h
@@ -0,0 +1,156 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef LIBARCHIVE_FUZZ_HELPERS_H_
+#define LIBARCHIVE_FUZZ_HELPERS_H_
+
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <ftw.h>
+#include <unistd.h>
+
+#include "archive.h"
+
+// Default maximum input size for fuzzers
+static constexpr size_t kDefaultMaxInputSize = 256 * 1024;  // 256KB
+
+// Buffer structure for archive reading callbacks
+struct Buffer {
+  const uint8_t* data;
+  size_t size;
+  size_t pos;
+};
+
+// Archive read callback function
+static la_ssize_t reader_callback(struct archive* a, void* client_data,
+                                  const void** buffer) {
+  (void)a;
+  Buffer* buf = static_cast<Buffer*>(client_data);
+
+  if (buf->pos >= buf->size) {
+    return 0;  // EOF
+  }
+
+  *buffer = buf->data + buf->pos;
+  size_t remaining = buf->size - buf->pos;
+  buf->pos = buf->size;  // Consume all remaining data
+  return static_cast<la_ssize_t>(remaining);
+}
+
+// Helper class for consuming fuzz data in structured ways
+class DataConsumer {
+ public:
+  DataConsumer(const uint8_t* data, size_t size)
+      : data_(data), size_(size), pos_(0) {}
+
+  bool empty() const { return pos_ >= size_; }
+  size_t remaining() const { return size_ - pos_; }
+
+  uint8_t consume_byte() {
+    if (pos_ >= size_) return 0;
+    return data_[pos_++];
+  }
+
+  uint16_t consume_u16() {
+    uint16_t val = 0;
+    if (pos_ + 2 <= size_) {
+      val = static_cast<uint16_t>(data_[pos_]) |
+            (static_cast<uint16_t>(data_[pos_ + 1]) << 8);
+      pos_ += 2;
+    }
+    return val;
+  }
+
+  uint32_t consume_u32() {
+    uint32_t val = 0;
+    if (pos_ + 4 <= size_) {
+      val = static_cast<uint32_t>(data_[pos_]) |
+            (static_cast<uint32_t>(data_[pos_ + 1]) << 8) |
+            (static_cast<uint32_t>(data_[pos_ + 2]) << 16) |
+            (static_cast<uint32_t>(data_[pos_ + 3]) << 24);
+      pos_ += 4;
+    }
+    return val;
+  }
+
+  int64_t consume_i64() {
+    int64_t val = 0;
+    if (pos_ + 8 <= size_) {
+      for (int i = 0; i < 8; i++) {
+        val |= static_cast<int64_t>(data_[pos_ + i]) << (8 * i);
+      }
+      pos_ += 8;
+    }
+    return val;
+  }
+
+  // Consume a null-terminated string up to max_len characters
+  // Returns pointer to internal buffer (valid until next consume_string call)
+  const char* consume_string(size_t max_len) {
+    if (max_len > sizeof(string_buf_) - 1) {
+      max_len = sizeof(string_buf_) - 1;
+    }
+    size_t avail = size_ - pos_;
+    size_t len = (avail < max_len) ? avail : max_len;
+    size_t actual_len = 0;
+
+    while (actual_len < len && pos_ < size_) {
+      char c = static_cast<char>(data_[pos_++]);
+      if (c == '\0') break;
+      string_buf_[actual_len++] = c;
+    }
+    string_buf_[actual_len] = '\0';
+    return string_buf_;
+  }
+
+  // Consume raw bytes into a buffer
+  size_t consume_bytes(void* out, size_t len) {
+    size_t avail = size_ - pos_;
+    size_t to_copy = (avail < len) ? avail : len;
+    if (to_copy > 0) {
+      memcpy(out, data_ + pos_, to_copy);
+      pos_ += to_copy;
+    }
+    return to_copy;
+  }
+
+  // Get remaining data as a buffer
+  const uint8_t* remaining_data() const {
+    return data_ + pos_;
+  }
+
+ private:
+  const uint8_t* data_;
+  size_t size_;
+  size_t pos_;
+  char string_buf_[512];
+};
+
+// Callback for nftw to remove files/directories
+static int remove_callback(const char* fpath, const struct stat* sb,
+                           int typeflag, struct FTW* ftwbuf) {
+  (void)sb;
+  (void)typeflag;
+  (void)ftwbuf;
+  return remove(fpath);
+}
+
+// Recursively remove a directory tree (safer than system("rm -rf ..."))
+static int remove_directory_tree(const char* path) {
+  // nftw with FTW_DEPTH processes directory contents before the directory itself
+  return nftw(path, remove_callback, 64, FTW_DEPTH | FTW_PHYS);
+}
+
+#endif  // LIBARCHIVE_FUZZ_HELPERS_H_
diff --git a/contrib/oss-fuzz/libarchive_7zip_fuzzer.cc b/contrib/oss-fuzz/libarchive_7zip_fuzzer.cc
new file mode 100644
index 000000000000..74b3b2ad98d0
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_7zip_fuzzer.cc
@@ -0,0 +1,63 @@
+/*
+ * 7-Zip format specific fuzzer for libarchive
+ * Targets 7-Zip parsing and decompression code paths
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;  // 512KB
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  // Enable 7-Zip format specifically
+  archive_read_support_format_7zip(a);
+  // Enable all filters for 7z internal compression
+  archive_read_support_filter_all(a);
+
+  // Set passphrase for encrypted archives
+  archive_read_add_passphrase(a, "password");
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    // Exercise entry metadata access
+    archive_entry_pathname(entry);
+    archive_entry_pathname_w(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_is_encrypted(entry);
+    archive_entry_is_data_encrypted(entry);
+    archive_entry_is_metadata_encrypted(entry);
+
+    // Read data
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_7zip_fuzzer.dict b/contrib/oss-fuzz/libarchive_7zip_fuzzer.dict
new file mode 100644
index 000000000000..3bee01a3bf72
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_7zip_fuzzer.dict
@@ -0,0 +1,47 @@
+# 7-Zip format dictionary
+# Magic bytes
+"7z\xbc\xaf\x27\x1c"
+"\x37\x7a\xbc\xaf\x27\x1c"
+
+# Common property IDs
+"\x00"
+"\x01"
+"\x02"
+"\x03"
+"\x04"
+"\x05"
+"\x06"
+"\x07"
+"\x08"
+"\x09"
+"\x0a"
+"\x0b"
+"\x0c"
+"\x0d"
+"\x0e"
+"\x0f"
+"\x10"
+"\x11"
+"\x17"
+"\x19"
+"\x21"
+"\x23"
+"\x24"
+"\x25"
+
+# Compression method IDs
+"\x00\x00"
+"\x00\x03"
+"\x00\x04"
+"\x00\x06"
+"\x01\x01"
+"\x03\x01\x01"
+"\x04\x01\x08"
+"\x04\x02\x02"
+"\x21\x01"
+"\x30\x01\x01"
+
+# Encryption
+"\x06\xf1\x07\x01"
+"Password"
+"password"
diff --git a/contrib/oss-fuzz/libarchive_7zip_fuzzer.options b/contrib/oss-fuzz/libarchive_7zip_fuzzer.options
new file mode 100644
index 000000000000..d2d9f0ed27d2
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_7zip_fuzzer.options
@@ -0,0 +1,10 @@
+[libfuzzer]
+max_len = 524288
+timeout = 60
+rss_limit_mb = 2048
+
+[honggfuzz]
+timeout = 60
+
+[afl]
+timeout = 60
diff --git a/contrib/oss-fuzz/libarchive_ar_fuzzer.cc b/contrib/oss-fuzz/libarchive_ar_fuzzer.cc
new file mode 100644
index 000000000000..3ad88084d440
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_ar_fuzzer.cc
@@ -0,0 +1,54 @@
+/*
+ * AR (Unix archive) format fuzzer for libarchive
+ * Tests BSD and GNU ar formats
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_ar(a);
+  archive_read_support_filter_all(a);
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_uid(entry);
+    archive_entry_gid(entry);
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_ar_fuzzer.dict b/contrib/oss-fuzz/libarchive_ar_fuzzer.dict
new file mode 100644
index 000000000000..4f2e3db1b3ac
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_ar_fuzzer.dict
@@ -0,0 +1,20 @@
+# AR format dictionary
+
+# AR magic
+"!<arch>\x0a"
+
+# File header terminator
+"\x60\x0a"
+
+# Special entries
+"/"
+"//"
+"/SYM64/"
+
+# Common permissions
+"100644  "
+"100755  "
+
+# UID/GID fields
+"0     "
+"1000  "
diff --git a/contrib/oss-fuzz/libarchive_cab_fuzzer.cc b/contrib/oss-fuzz/libarchive_cab_fuzzer.cc
new file mode 100644
index 000000000000..2b7086005131
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_cab_fuzzer.cc
@@ -0,0 +1,51 @@
+/*
+ * CAB (Microsoft Cabinet) format fuzzer for libarchive
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_cab(a);
+  archive_read_support_filter_all(a);
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_cab_fuzzer.dict b/contrib/oss-fuzz/libarchive_cab_fuzzer.dict
new file mode 100644
index 000000000000..76e1d3bcd7e9
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_cab_fuzzer.dict
@@ -0,0 +1,23 @@
+# CAB (Microsoft Cabinet) format dictionary
+
+# CAB signature
+"MSCF"
+"\x4d\x53\x43\x46"
+
+# Version
+"\x03\x01"
+
+# Compression types
+"\x00\x00"
+"\x01\x00"
+"\x02\x00"
+"\x03\x00"
+
+# Folder count patterns
+"\x01\x00"
+"\x02\x00"
+
+# Header flags
+"\x00\x00"
+"\x01\x00"
+"\x04\x00"
diff --git a/contrib/oss-fuzz/libarchive_cpio_fuzzer.cc b/contrib/oss-fuzz/libarchive_cpio_fuzzer.cc
new file mode 100644
index 000000000000..acbca31c7433
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_cpio_fuzzer.cc
@@ -0,0 +1,58 @@
+/*
+ * CPIO format fuzzer for libarchive
+ * Tests all CPIO variants: binary, odc, newc, crc
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_cpio(a);
+  archive_read_support_filter_all(a);
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_uid(entry);
+    archive_entry_gid(entry);
+    archive_entry_ino(entry);
+    archive_entry_nlink(entry);
+    archive_entry_rdev(entry);
+    archive_entry_hardlink(entry);
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_cpio_fuzzer.dict b/contrib/oss-fuzz/libarchive_cpio_fuzzer.dict
new file mode 100644
index 000000000000..b7ceeee1c39b
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_cpio_fuzzer.dict
@@ -0,0 +1,25 @@
+# CPIO format dictionary
+
+# Binary magic (little endian)
+"\xc7\x71"
+
+# Binary magic (big endian)
+"\x71\xc7"
+
+# ASCII odc magic
+"070707"
+
+# ASCII newc magic
+"070701"
+
+# ASCII crc magic
+"070702"
+
+# Common trailer
+"TRAILER!!!"
+
+# Common field patterns
+"00000000"
+"00000001"
+"000001ed"
+"000003e8"
diff --git a/contrib/oss-fuzz/libarchive_encryption_fuzzer.cc b/contrib/oss-fuzz/libarchive_encryption_fuzzer.cc
new file mode 100644
index 000000000000..402265cb5e07
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_encryption_fuzzer.cc
@@ -0,0 +1,101 @@
+/*
+ * Encrypted archive fuzzer for libarchive
+ * Tests password/passphrase handling across formats
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;
+
+// Passphrase callback for testing
+static const char *test_passphrases[] = {
+  "password",
+  "test",
+  "123456",
+  "",
+  "secret",
+  NULL
+};
+
+static int passphrase_idx = 0;
+
+static const char* passphrase_callback(struct archive *a, void *client_data) {
+  (void)a;
+  (void)client_data;
+  const char *pass = test_passphrases[passphrase_idx];
+  if (pass != NULL) {
+    passphrase_idx++;
+  }
+  return pass;
+}
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  // Reset passphrase index
+  passphrase_idx = 0;
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  // Enable all formats that support encryption
+  archive_read_support_format_zip(a);
+  archive_read_support_format_7zip(a);
+  archive_read_support_format_rar(a);
+  archive_read_support_format_rar5(a);
+  archive_read_support_filter_all(a);
+
+  // Set up passphrase callback
+  archive_read_set_passphrase_callback(a, NULL, passphrase_callback);
+
+  // Also add some static passphrases
+  archive_read_add_passphrase(a, "password");
+  archive_read_add_passphrase(a, "test123");
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+  int entry_count = 0;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK && entry_count < 100) {
+    archive_entry_pathname(entry);
+
+    // Check encryption status
+    int is_encrypted = archive_entry_is_encrypted(entry);
+    int is_data_encrypted = archive_entry_is_data_encrypted(entry);
+    int is_meta_encrypted = archive_entry_is_metadata_encrypted(entry);
+    (void)is_encrypted;
+    (void)is_data_encrypted;
+    (void)is_meta_encrypted;
+
+    // Check if archive has encrypted entries
+    archive_read_has_encrypted_entries(a);
+
+    // Try to read data (may fail due to wrong password)
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+
+    entry_count++;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_encryption_fuzzer.options b/contrib/oss-fuzz/libarchive_encryption_fuzzer.options
new file mode 100644
index 000000000000..d2d9f0ed27d2
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_encryption_fuzzer.options
@@ -0,0 +1,10 @@
+[libfuzzer]
+max_len = 524288
+timeout = 60
+rss_limit_mb = 2048
+
+[honggfuzz]
+timeout = 60
+
+[afl]
+timeout = 60
diff --git a/contrib/oss-fuzz/libarchive_entry_fuzzer.cc b/contrib/oss-fuzz/libarchive_entry_fuzzer.cc
new file mode 100644
index 000000000000..d8aa8b51ecf4
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_entry_fuzzer.cc
@@ -0,0 +1,105 @@
+/*
+ * Archive entry fuzzer for libarchive
+ * Targets archive_entry_* functions including ACL, linkify, and metadata
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 64 * 1024;  // 64KB
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  DataConsumer consumer(buf, len);
+
+  struct archive_entry *entry = archive_entry_new();
+  if (entry == NULL) {
+    return 0;
+  }
+
+  // Set basic entry properties
+  archive_entry_set_pathname(entry, consumer.consume_string(256));
+  archive_entry_set_size(entry, consumer.consume_i64());
+  archive_entry_set_mode(entry, consumer.consume_u32());
+  archive_entry_set_uid(entry, consumer.consume_u32());
+  archive_entry_set_gid(entry, consumer.consume_u32());
+  archive_entry_set_mtime(entry, consumer.consume_i64(), 0);
+  archive_entry_set_atime(entry, consumer.consume_i64(), 0);
+  archive_entry_set_ctime(entry, consumer.consume_i64(), 0);
+  archive_entry_set_birthtime(entry, consumer.consume_i64(), 0);
+
+  // Set various string fields
+  archive_entry_set_uname(entry, consumer.consume_string(64));
+  archive_entry_set_gname(entry, consumer.consume_string(64));
+  archive_entry_set_symlink(entry, consumer.consume_string(256));
+  archive_entry_set_hardlink(entry, consumer.consume_string(256));
+
+  // Exercise ACL functions (low coverage targets)
+  int acl_type = consumer.consume_byte() & 0x0F;
+  int acl_permset = consumer.consume_u32();
+  int acl_tag = consumer.consume_byte() & 0x0F;
+  int acl_qual = consumer.consume_u32();
+  const char *acl_name = consumer.consume_string(64);
+
+  archive_entry_acl_add_entry(entry, acl_type, acl_permset, acl_tag, acl_qual, acl_name);
+
+  // Add more ACL entries based on remaining data
+  while (!consumer.empty() && consumer.remaining() > 10) {
+    acl_type = consumer.consume_byte() & 0x0F;
+    acl_permset = consumer.consume_u32();
+    acl_tag = consumer.consume_byte() & 0x0F;
+    acl_qual = consumer.consume_u32();
+    acl_name = consumer.consume_string(32);
+    archive_entry_acl_add_entry(entry, acl_type, acl_permset, acl_tag, acl_qual, acl_name);
+  }
+
+  // Exercise ACL text conversion functions (archive_acl_to_text_* are uncovered)
+  ssize_t text_len;
+  char *acl_text = archive_entry_acl_to_text(entry, &text_len, ARCHIVE_ENTRY_ACL_TYPE_ACCESS);
+  if (acl_text) {
+    // Parse the text back
+    archive_entry_acl_from_text(entry, acl_text, ARCHIVE_ENTRY_ACL_TYPE_ACCESS);
+    free(acl_text);
+  }
+
+  acl_text = archive_entry_acl_to_text(entry, &text_len, ARCHIVE_ENTRY_ACL_TYPE_DEFAULT);
+  if (acl_text) {
+    free(acl_text);
+  }
+
+  acl_text = archive_entry_acl_to_text(entry, &text_len, ARCHIVE_ENTRY_ACL_TYPE_NFS4);
+  if (acl_text) {
+    free(acl_text);
+  }
+
+  // Exercise wide character versions
+  wchar_t *acl_text_w = archive_entry_acl_to_text_w(entry, &text_len, ARCHIVE_ENTRY_ACL_TYPE_ACCESS);
+  if (acl_text_w) {
+    free(acl_text_w);
+  }
+
+  // Get pathname variants
+  archive_entry_pathname(entry);
+  archive_entry_pathname_w(entry);
+  archive_entry_pathname_utf8(entry);
+
+  // Clone the entry
+  struct archive_entry *entry2 = archive_entry_clone(entry);
+  if (entry2) {
+    archive_entry_free(entry2);
+  }
+
+  // Clear and reuse
+  archive_entry_clear(entry);
+
+  archive_entry_free(entry);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_filter_fuzzer.cc b/contrib/oss-fuzz/libarchive_filter_fuzzer.cc
new file mode 100644
index 000000000000..cfd1807ecfd4
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_filter_fuzzer.cc
@@ -0,0 +1,65 @@
+/*
+ * Compression filter fuzzer for libarchive
+ * Tests decompression of gzip, bzip2, xz, lzma, zstd, lz4, etc.
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 256 * 1024;
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  // Enable raw format (just decompress, no archive format)
+  archive_read_support_format_raw(a);
+
+  // Enable all compression filters
+  archive_read_support_filter_all(a);
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(8192, 0);
+  struct archive_entry *entry;
+
+  if (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    // Get filter info
+    int filter_count = archive_filter_count(a);
+    for (int i = 0; i < filter_count; i++) {
+      archive_filter_name(a, i);
+      archive_filter_code(a, i);
+      archive_filter_bytes(a, i);
+    }
+
+    // Read all decompressed data
+    ssize_t total = 0;
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0) {
+      total += r;
+      // Limit total decompressed size to prevent zip bombs
+      if (total > 10 * 1024 * 1024) {
+        break;
+      }
+    }
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_filter_fuzzer.dict b/contrib/oss-fuzz/libarchive_filter_fuzzer.dict
new file mode 100644
index 000000000000..2f780c9f4d0f
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_filter_fuzzer.dict
@@ -0,0 +1,33 @@
+# Compression filter dictionary
+
+# GZIP magic
+"\x1f\x8b"
+"\x1f\x8b\x08"
+
+# BZIP2 magic
+"BZh"
+"BZ0"
+
+# XZ magic
+"\xfd7zXZ\x00"
+
+# LZMA magic
+"\x5d\x00\x00"
+
+# ZSTD magic
+"\x28\xb5\x2f\xfd"
+
+# LZ4 magic
+"\x04\x22\x4d\x18"
+
+# Compress (.Z) magic
+"\x1f\x9d"
+
+# LZIP magic
+"LZIP"
+
+# LRZIP magic
+"LRZI"
+
+# LZO magic
+"\x89LZO\x00\x0d\x0a\x1a\x0a"
diff --git a/contrib/oss-fuzz/libarchive_filter_fuzzer.options b/contrib/oss-fuzz/libarchive_filter_fuzzer.options
new file mode 100644
index 000000000000..5a0374b3167d
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_filter_fuzzer.options
@@ -0,0 +1,10 @@
+[libfuzzer]
+max_len = 262144
+timeout = 30
+rss_limit_mb = 2048
+
+[honggfuzz]
+timeout = 30
+
+[afl]
+timeout = 30
diff --git a/contrib/oss-fuzz/libarchive_fuzzer.cc b/contrib/oss-fuzz/libarchive_fuzzer.cc
index bc7f865b69c5..09a9b1cc698f 100644
--- a/contrib/oss-fuzz/libarchive_fuzzer.cc
+++ b/contrib/oss-fuzz/libarchive_fuzzer.cc
@@ -3,20 +3,7 @@
 #include <vector>
 
 #include "archive.h"
-
-struct Buffer {
-  const uint8_t *buf;
-  size_t len;
-};
-
-ssize_t reader_callback(struct archive *a, void *client_data,
-                        const void **block) {
-  Buffer *buffer = reinterpret_cast<Buffer *>(client_data);
-  *block = buffer->buf;
-  ssize_t len = buffer->len;
-  buffer->len = 0;
-  return len;
-}
+#include "fuzz_helpers.h"
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
   int ret;
@@ -26,7 +13,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
   archive_read_support_filter_all(a);
   archive_read_support_format_all(a);
 
-  Buffer buffer = {buf, len};
+  Buffer buffer = {buf, len, 0};
   archive_read_open(a, &buffer, NULL, reader_callback, NULL);
 
   std::vector<uint8_t> data_buffer(getpagesize(), 0);
diff --git a/contrib/oss-fuzz/libarchive_fuzzer.dict b/contrib/oss-fuzz/libarchive_fuzzer.dict
new file mode 100644
index 000000000000..390b68567ad5
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_fuzzer.dict
@@ -0,0 +1,76 @@
+# General libarchive dictionary covering multiple formats
+
+# TAR magic
+"ustar"
+"ustar\x00"
+"ustar  \x00"
+"\x00\x00"
+
+# ZIP magic
+"PK\x03\x04"
+"PK\x05\x06"
+"PK\x01\x02"
+"PK\x07\x08"
+
+# 7z magic
+"7z\xbc\xaf\x27\x1c"
+
+# RAR magic
+"Rar!\x1a\x07\x00"
+"Rar!\x1a\x07\x01\x00"
+
+# XAR magic
+"xar!"
+
+# CPIO magic
+"\xc7\x71"
+"070701"
+"070702"
+"070707"
+
+# CAB magic
+"MSCF"
+
+# LHA magic
+"-lh"
+"-lz"
+
+# AR magic
+"!<arch>\x0a"
+
+# ISO9660 magic
+"CD001"
+
+# GZIP magic
+"\x1f\x8b"
+
+# BZIP2 magic
+"BZ"
+"BZh"
+
+# XZ magic
+"\xfd7zXZ\x00"
+
+# LZMA magic
+"\x5d\x00\x00"
+
+# ZSTD magic
+"\x28\xb5\x2f\xfd"
+
+# LZ4 magic
+"\x04\x22\x4d\x18"
+
+# Common paths
+"/"
+"./"
+"../"
+"./test"
+"test.txt"
+"test/"
+
+# Common attributes
+"\x00\x00\x00\x00"
+"\xff\xff\xff\xff"
+
+# Passphrase
+"password"
diff --git a/contrib/oss-fuzz/libarchive_fuzzer.options b/contrib/oss-fuzz/libarchive_fuzzer.options
new file mode 100644
index 000000000000..7b1139e29326
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_fuzzer.options
@@ -0,0 +1,9 @@
+[libfuzzer]
+max_len = 524288
+timeout = 30
+
+[honggfuzz]
+timeout = 30
+
+[afl]
+timeout = 30
diff --git a/contrib/oss-fuzz/libarchive_iso9660_fuzzer.cc b/contrib/oss-fuzz/libarchive_iso9660_fuzzer.cc
new file mode 100644
index 000000000000..6cdaff23a09c
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_iso9660_fuzzer.cc
@@ -0,0 +1,58 @@
+/*
+ * ISO9660 format fuzzer for libarchive
+ * Tests ISO, Joliet, and Rock Ridge extensions
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 1024 * 1024;  // 1MB for ISO images
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_iso9660(a);
+  archive_read_support_filter_all(a);
+
+  // Set options to test various ISO extensions
+  archive_read_set_options(a, "iso9660:joliet,iso9660:rockridge");
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_pathname_w(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_symlink(entry);
+    archive_entry_hardlink(entry);
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_iso9660_fuzzer.dict b/contrib/oss-fuzz/libarchive_iso9660_fuzzer.dict
new file mode 100644
index 000000000000..6dac3eaa52ff
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_iso9660_fuzzer.dict
@@ -0,0 +1,36 @@
+# ISO9660 format dictionary
+
+# Volume descriptor type
+"\x00"
+"\x01"
+"\x02"
+"\xff"
+
+# Standard identifier
+"CD001"
+
+# Volume descriptor version
+"\x01"
+
+# Joliet escape sequences
+"%/@"
+"%/C"
+"%/E"
+
+# Rock Ridge signatures
+"SP"
+"RR"
+"CE"
+"PX"
+"PN"
+"SL"
+"NM"
+"CL"
+"PL"
+"RE"
+"TF"
+"SF"
+
+# System use
+"ER"
+"ES"
diff --git a/contrib/oss-fuzz/libarchive_iso9660_fuzzer.options b/contrib/oss-fuzz/libarchive_iso9660_fuzzer.options
new file mode 100644
index 000000000000..f04ee45fd24b
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_iso9660_fuzzer.options
@@ -0,0 +1,10 @@
+[libfuzzer]
+max_len = 1048576
+timeout = 60
+rss_limit_mb = 2048
+
+[honggfuzz]
+timeout = 60
+
+[afl]
+timeout = 60
diff --git a/contrib/oss-fuzz/libarchive_lha_fuzzer.cc b/contrib/oss-fuzz/libarchive_lha_fuzzer.cc
new file mode 100644
index 000000000000..3957d3ed3d38
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_lha_fuzzer.cc
@@ -0,0 +1,54 @@
+/*
+ * LHA/LZH format fuzzer for libarchive
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_lha(a);
+  archive_read_support_filter_all(a);
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_pathname_w(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_uid(entry);
+    archive_entry_gid(entry);
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_lha_fuzzer.dict b/contrib/oss-fuzz/libarchive_lha_fuzzer.dict
new file mode 100644
index 000000000000..38ca18406442
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_lha_fuzzer.dict
@@ -0,0 +1,26 @@
+# LHA/LZH format dictionary
+
+# Compression methods
+"-lh0-"
+"-lh1-"
+"-lh2-"
+"-lh3-"
+"-lh4-"
+"-lh5-"
+"-lh6-"
+"-lh7-"
+"-lhd-"
+"-lzs-"
+"-lz4-"
+"-lz5-"
+
+# OS type
+"\x00"
+"\x4d"
+"\x55"
+
+# Header levels
+"\x00"
+"\x01"
+"\x02"
+"\x03"
diff --git a/contrib/oss-fuzz/libarchive_linkify_fuzzer.cc b/contrib/oss-fuzz/libarchive_linkify_fuzzer.cc
new file mode 100644
index 000000000000..64c22dca959c
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_linkify_fuzzer.cc
@@ -0,0 +1,110 @@
+/*
+ * Archive entry link resolver fuzzer for libarchive
+ * Targets archive_entry_linkify (complexity: 775, zero coverage)
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 64 * 1024;  // 64KB
+
+// Simple data consumer
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  DataConsumer consumer(buf, len);
+
+  // Create a link resolver
+  struct archive_entry_linkresolver *resolver = archive_entry_linkresolver_new();
+  if (resolver == NULL) {
+    return 0;
+  }
+
+  // Set the format strategy based on input
+  uint8_t strategy = consumer.consume_byte() % 5;
+  int format;
+  switch (strategy) {
+    case 0: format = ARCHIVE_FORMAT_TAR_GNUTAR; break;
+    case 1: format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; break;
+    case 2: format = ARCHIVE_FORMAT_CPIO_POSIX; break;
+    case 3: format = ARCHIVE_FORMAT_CPIO_SVR4_NOCRC; break;
+    default: format = ARCHIVE_FORMAT_TAR_USTAR; break;
+  }
+  archive_entry_linkresolver_set_strategy(resolver, format);
+
+  // Create multiple entries to test linkify with hardlinks
+  struct archive_entry *entries[32];
+  int num_entries = 0;
+
+  while (!consumer.empty() && num_entries < 32 && consumer.remaining() > 20) {
+    struct archive_entry *entry = archive_entry_new();
+    if (entry == NULL) break;
+
+    // Set pathname
+    archive_entry_set_pathname(entry, consumer.consume_string(64));
+
+    // Set inode and device for hardlink detection
+    archive_entry_set_ino(entry, consumer.consume_i64());
+    archive_entry_set_dev(entry, consumer.consume_u32());
+    archive_entry_set_nlink(entry, (consumer.consume_byte() % 5) + 1);
+
+    // Set mode (regular file or directory)
+    uint8_t ftype = consumer.consume_byte() % 2;
+    mode_t mode = ftype ? (S_IFDIR | 0755) : (S_IFREG | 0644);
+    archive_entry_set_mode(entry, mode);
+
+    archive_entry_set_size(entry, consumer.consume_i64() & 0xFFFF);
+    archive_entry_set_uid(entry, consumer.consume_u32() & 0xFFFF);
+    archive_entry_set_gid(entry, consumer.consume_u32() & 0xFFFF);
+
+    entries[num_entries++] = entry;
+  }
+
+  // Now run all entries through the linkresolver
+  for (int i = 0; i < num_entries; i++) {
+    struct archive_entry *entry = entries[i];
+    struct archive_entry *spare = NULL;
+
+    // This is the main function we want to fuzz (zero coverage)
+    archive_entry_linkify(resolver, &entry, &spare);
+
+    // entry and spare may be modified by linkify
+    // We still need to free the original entries we allocated
+    if (spare != NULL) {
+      archive_entry_free(spare);
+    }
+  }
+
+  // Free remaining entries from the resolver
+  struct archive_entry *entry = NULL;
+  struct archive_entry *spare = NULL;
+  while (1) {
+    archive_entry_linkify(resolver, &entry, &spare);
+    if (entry == NULL)
+      break;
+    archive_entry_free(entry);
+    entry = NULL;
+    if (spare != NULL) {
+      archive_entry_free(spare);
+      spare = NULL;
+    }
+  }
+
+  // Free all our created entries
+  for (int i = 0; i < num_entries; i++) {
+    if (entries[i] != NULL) {
+      archive_entry_free(entries[i]);
+    }
+  }
+
+  archive_entry_linkresolver_free(resolver);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_match_fuzzer.cc b/contrib/oss-fuzz/libarchive_match_fuzzer.cc
new file mode 100644
index 000000000000..a0f8ba7dae84
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_match_fuzzer.cc
@@ -0,0 +1,96 @@
+/*
+ * Archive match fuzzer for libarchive
+ * Tests pattern matching, time matching, and owner matching
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 32 * 1024;
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  DataConsumer consumer(buf, len);
+
+  struct archive *match = archive_match_new();
+  if (match == NULL) {
+    return 0;
+  }
+
+  // Add various match patterns
+  while (!consumer.empty() && consumer.remaining() > 5) {
+    uint8_t match_type = consumer.consume_byte() % 6;
+
+    switch (match_type) {
+      case 0: {
+        // Pattern exclusion
+        const char *pattern = consumer.consume_string(64);
+        archive_match_exclude_pattern(match, pattern);
+        break;
+      }
+      case 1: {
+        // Pattern inclusion
+        const char *pattern = consumer.consume_string(64);
+        archive_match_include_pattern(match, pattern);
+        break;
+      }
+      case 2: {
+        // Time comparison (newer than)
+        int64_t sec = consumer.consume_i64();
+        int64_t nsec = consumer.consume_i64() % 1000000000;
+        archive_match_include_time(match, ARCHIVE_MATCH_MTIME | ARCHIVE_MATCH_NEWER,
+                                   sec, nsec);
+        break;
+      }
+      case 3: {
+        // Time comparison (older than)
+        int64_t sec = consumer.consume_i64();
+        int64_t nsec = consumer.consume_i64() % 1000000000;
+        archive_match_include_time(match, ARCHIVE_MATCH_MTIME | ARCHIVE_MATCH_OLDER,
+                                   sec, nsec);
+        break;
+      }
+      case 4: {
+        // UID inclusion
+        int64_t uid = consumer.consume_i64() & 0xFFFF;
+        archive_match_include_uid(match, uid);
+        break;
+      }
+      case 5: {
+        // GID inclusion
+        int64_t gid = consumer.consume_i64() & 0xFFFF;
+        archive_match_include_gid(match, gid);
+        break;
+      }
+    }
+  }
+
+  // Create a test entry and check if it matches
+  struct archive_entry *entry = archive_entry_new();
+  if (entry) {
+    archive_entry_set_pathname(entry, "test/file.txt");
+    archive_entry_set_mtime(entry, 1234567890, 0);
+    archive_entry_set_uid(entry, 1000);
+    archive_entry_set_gid(entry, 1000);
+    archive_entry_set_mode(entry, 0644 | 0100000);  // Regular file
+
+    // Test matching
+    archive_match_path_excluded(match, entry);
+    archive_match_time_excluded(match, entry);
+    archive_match_owner_excluded(match, entry);
+    archive_match_excluded(match, entry);
+
+    archive_entry_free(entry);
+  }
+
+  archive_match_free(match);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_mtree_fuzzer.cc b/contrib/oss-fuzz/libarchive_mtree_fuzzer.cc
new file mode 100644
index 000000000000..e0110d4e1bc4
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_mtree_fuzzer.cc
@@ -0,0 +1,61 @@
+/*
+ * MTREE format fuzzer for libarchive
+ * Tests mtree manifest parsing
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 256 * 1024;
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_mtree(a);
+  archive_read_support_filter_all(a);
+
+  // Enable checkfs option to test more code paths
+  archive_read_set_options(a, "mtree:checkfs");
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_uid(entry);
+    archive_entry_gid(entry);
+    archive_entry_uname(entry);
+    archive_entry_gname(entry);
+    archive_entry_symlink(entry);
+    archive_entry_fflags_text(entry);
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_mtree_fuzzer.dict b/contrib/oss-fuzz/libarchive_mtree_fuzzer.dict
new file mode 100644
index 000000000000..7241ea5d2242
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_mtree_fuzzer.dict
@@ -0,0 +1,47 @@
+# MTREE format dictionary
+
+# Keywords
+"/set"
+"/unset"
+".."
+
+# File types
+"type=file"
+"type=dir"
+"type=link"
+"type=block"
+"type=char"
+"type=fifo"
+"type=socket"
+
+# Attributes
+"mode="
+"uid="
+"gid="
+"uname="
+"gname="
+"size="
+"time="
+"link="
+"cksum="
+"md5="
+"md5digest="
+"sha1="
+"sha1digest="
+"sha256="
+"sha256digest="
+"sha384="
+"sha384digest="
+"sha512="
+"sha512digest="
+"rmd160="
+"rmd160digest="
+"flags="
+"nlink="
+"inode="
+"device="
+"resdevice="
+"contents="
+"optional"
+"ignore"
+"nochange"
diff --git a/contrib/oss-fuzz/libarchive_rar5_fuzzer.cc b/contrib/oss-fuzz/libarchive_rar5_fuzzer.cc
new file mode 100644
index 000000000000..2a7b97f87e7a
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_rar5_fuzzer.cc
@@ -0,0 +1,61 @@
+/*
+ * RAR5 format specific fuzzer for libarchive
+ * Targets RAR5 parsing code paths
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;  // 512KB
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  // Enable RAR5 format specifically
+  archive_read_support_format_rar5(a);
+  // Enable common filters
+  archive_read_support_filter_all(a);
+
+  // Set passphrase for encrypted archives
+  archive_read_add_passphrase(a, "password");
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    // Exercise entry metadata access
+    archive_entry_pathname(entry);
+    archive_entry_pathname_w(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_is_encrypted(entry);
+
+    // Read data
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_rar5_fuzzer.dict b/contrib/oss-fuzz/libarchive_rar5_fuzzer.dict
new file mode 100644
index 000000000000..f1e4311570f8
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_rar5_fuzzer.dict
@@ -0,0 +1,37 @@
+# RAR5 format dictionary
+# Magic bytes (RAR5 signature)
+"Rar!\x1a\x07\x01\x00"
+"\x52\x61\x72\x21\x1a\x07\x01\x00"
+
+# Common header types
+"\x01"
+"\x02"
+"\x03"
+"\x04"
+"\x05"
+
+# Common flags
+"\x00\x00"
+"\x01\x00"
+"\x02\x00"
+"\x04\x00"
+
+# Compression methods
+"\x00"
+"\x01"
+"\x02"
+"\x03"
+"\x04"
+"\x05"
+
+# File attributes
+"\x20\x00\x00\x00"
+"\x10\x00\x00\x00"
+
+# Encryption marker
+"\x80"
+"password"
+"Password"
+
+# End of archive
+"\x1d\x77\x56\x51\x03\x05\x04\x00"
diff --git a/contrib/oss-fuzz/libarchive_rar_fuzzer.cc b/contrib/oss-fuzz/libarchive_rar_fuzzer.cc
new file mode 100644
index 000000000000..dd94181bcc06
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_rar_fuzzer.cc
@@ -0,0 +1,56 @@
+/*
+ * RAR v4 format fuzzer for libarchive
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_rar(a);
+  archive_read_support_filter_all(a);
+
+  // Add passphrase for encrypted RARs
+  archive_read_add_passphrase(a, "password");
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_pathname_w(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_is_encrypted(entry);
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_read_disk_fuzzer.cc b/contrib/oss-fuzz/libarchive_read_disk_fuzzer.cc
new file mode 100644
index 000000000000..91ccea15fde6
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_read_disk_fuzzer.cc
@@ -0,0 +1,76 @@
+/*
+ * Archive read disk fuzzer for libarchive
+ * Tests filesystem traversal and entry creation from paths
+ * Security-critical: path traversal, symlink handling
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 16 * 1024;
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  DataConsumer consumer(buf, len);
+
+  struct archive *a = archive_read_disk_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  // Configure disk reader behavior
+  uint8_t flags = consumer.consume_byte();
+  if (flags & 0x01) {
+    archive_read_disk_set_symlink_logical(a);
+  } else if (flags & 0x02) {
+    archive_read_disk_set_symlink_physical(a);
+  } else {
+    archive_read_disk_set_symlink_hybrid(a);
+  }
+
+  archive_read_disk_set_standard_lookup(a);
+
+  // Set behavior flags
+  int behavior = 0;
+  if (flags & 0x04) behavior |= ARCHIVE_READDISK_RESTORE_ATIME;
+  if (flags & 0x08) behavior |= ARCHIVE_READDISK_HONOR_NODUMP;
+  if (flags & 0x10) behavior |= ARCHIVE_READDISK_NO_TRAVERSE_MOUNTS;
+  archive_read_disk_set_behavior(a, behavior);
+
+  // Create an entry and test entry_from_file with various paths
+  struct archive_entry *entry = archive_entry_new();
+  if (entry) {
+    // Test with /tmp (safe, always exists)
+    archive_entry_copy_pathname(entry, "/tmp");
+    archive_read_disk_entry_from_file(a, entry, -1, NULL);
+
+    // Get entry info
+    archive_entry_pathname(entry);
+    archive_entry_size(entry);
+    archive_entry_mode(entry);
+    archive_entry_uid(entry);
+    archive_entry_gid(entry);
+
+    // Test name lookups
+    archive_read_disk_gname(a, 0);
+    archive_read_disk_uname(a, 0);
+    archive_read_disk_gname(a, 1000);
+    archive_read_disk_uname(a, 1000);
+
+    archive_entry_free(entry);
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_roundtrip_fuzzer.cc b/contrib/oss-fuzz/libarchive_roundtrip_fuzzer.cc
new file mode 100644
index 000000000000..15d4434bc4eb
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_roundtrip_fuzzer.cc
@@ -0,0 +1,110 @@
+/*
+ * Archive roundtrip fuzzer for libarchive
+ * Writes an archive then reads it back - tests write/read consistency
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 64 * 1024;
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len < 10 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  DataConsumer consumer(buf, len);
+  std::vector<uint8_t> archive_data;
+  archive_data.reserve(len * 2);
+
+  // Phase 1: Write an archive
+  struct archive *writer = archive_write_new();
+  if (writer == NULL) {
+    return 0;
+  }
+
+  // Select format
+  uint8_t format = consumer.consume_byte() % 5;
+  switch (format) {
+    case 0: archive_write_set_format_pax_restricted(writer); break;
+    case 1: archive_write_set_format_ustar(writer); break;
+    case 2: archive_write_set_format_cpio_newc(writer); break;
+    case 3: archive_write_set_format_zip(writer); break;
+    default: archive_write_set_format_gnutar(writer); break;
+  }
+
+  archive_write_add_filter_none(writer);
+
+  // Open to memory
+  size_t used = 0;
+  archive_data.resize(len * 4);
+  if (archive_write_open_memory(writer, archive_data.data(), archive_data.size(), &used) != ARCHIVE_OK) {
+    archive_write_free(writer);
+    return 0;
+  }
+
+  // Write entries
+  int entry_count = 0;
+  while (!consumer.empty() && entry_count < 5 && consumer.remaining() > 10) {
+    struct archive_entry *entry = archive_entry_new();
+    if (entry == NULL) break;
+
+    archive_entry_set_pathname(entry, consumer.consume_string(32));
+    archive_entry_set_mode(entry, S_IFREG | 0644);
+    archive_entry_set_uid(entry, consumer.consume_u32() & 0xFFFF);
+    archive_entry_set_gid(entry, consumer.consume_u32() & 0xFFFF);
+
+    uint8_t data_buf[256];
+    size_t data_len = consumer.consume_bytes(data_buf, 256);
+    archive_entry_set_size(entry, data_len);
+
+    if (archive_write_header(writer, entry) == ARCHIVE_OK && data_len > 0) {
+      archive_write_data(writer, data_buf, data_len);
+    }
+
+    archive_entry_free(entry);
+    entry_count++;
+  }
+
+  archive_write_close(writer);
+  archive_write_free(writer);
+
+  if (used == 0) {
+    return 0;
+  }
+
+  // Phase 2: Read the archive back
+  struct archive *reader = archive_read_new();
+  if (reader == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_all(reader);
+  archive_read_support_filter_all(reader);
+
+  if (archive_read_open_memory(reader, archive_data.data(), used) != ARCHIVE_OK) {
+    archive_read_free(reader);
+    return 0;
+  }
+
+  std::vector<uint8_t> read_buffer(4096, 0);
+  struct archive_entry *entry;
+  while (archive_read_next_header(reader, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_size(entry);
+
+    ssize_t r;
+    while ((r = archive_read_data(reader, read_buffer.data(), read_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(reader);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_roundtrip_fuzzer.options b/contrib/oss-fuzz/libarchive_roundtrip_fuzzer.options
new file mode 100644
index 000000000000..1489609db06e
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_roundtrip_fuzzer.options
@@ -0,0 +1,3 @@
+[libfuzzer]
+max_len = 65536
+timeout = 30
diff --git a/contrib/oss-fuzz/libarchive_seek_fuzzer.cc b/contrib/oss-fuzz/libarchive_seek_fuzzer.cc
new file mode 100644
index 000000000000..11e958030701
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_seek_fuzzer.cc
@@ -0,0 +1,125 @@
+/*
+ * Archive seek/read fuzzer for libarchive
+ * Tests seeking within archives and reading at random positions
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 256 * 1024;
+
+struct SeekableBuffer {
+  const uint8_t *buf;
+  size_t len;
+  size_t pos;
+};
+
+static ssize_t seek_read_callback(struct archive *a, void *client_data,
+                                  const void **block) {
+  (void)a;
+  SeekableBuffer *buffer = reinterpret_cast<SeekableBuffer *>(client_data);
+  if (buffer->pos >= buffer->len) {
+    *block = NULL;
+    return 0;
+  }
+  *block = buffer->buf + buffer->pos;
+  size_t avail = buffer->len - buffer->pos;
+  size_t to_read = (avail > 4096) ? 4096 : avail;
+  buffer->pos += to_read;
+  return to_read;
+}
+
+static la_int64_t seek_callback(struct archive *a, void *client_data,
+                                la_int64_t offset, int whence) {
+  (void)a;
+  SeekableBuffer *buffer = reinterpret_cast<SeekableBuffer *>(client_data);
+  la_int64_t new_pos;
+
+  switch (whence) {
+    case SEEK_SET:
+      new_pos = offset;
+      break;
+    case SEEK_CUR:
+      new_pos = static_cast<la_int64_t>(buffer->pos) + offset;
+      break;
+    case SEEK_END:
+      new_pos = static_cast<la_int64_t>(buffer->len) + offset;
+      break;
+    default:
+      return ARCHIVE_FATAL;
+  }
+
+  if (new_pos < 0) new_pos = 0;
+  if (new_pos > static_cast<la_int64_t>(buffer->len))
+    new_pos = static_cast<la_int64_t>(buffer->len);
+
+  buffer->pos = static_cast<size_t>(new_pos);
+  return new_pos;
+}
+
+static la_int64_t skip_callback(struct archive *a, void *client_data,
+                                la_int64_t request) {
+  (void)a;
+  SeekableBuffer *buffer = reinterpret_cast<SeekableBuffer *>(client_data);
+  size_t avail = buffer->len - buffer->pos;
+  la_int64_t to_skip = (request > static_cast<la_int64_t>(avail))
+                           ? static_cast<la_int64_t>(avail)
+                           : request;
+  buffer->pos += static_cast<size_t>(to_skip);
+  return to_skip;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  // Enable formats that benefit from seeking
+  archive_read_support_format_zip_seekable(a);
+  archive_read_support_format_7zip(a);
+  archive_read_support_format_rar(a);
+  archive_read_support_format_rar5(a);
+  archive_read_support_format_iso9660(a);
+  archive_read_support_filter_all(a);
+
+  SeekableBuffer buffer = {buf, len, 0};
+
+  archive_read_set_read_callback(a, seek_read_callback);
+  archive_read_set_seek_callback(a, seek_callback);
+  archive_read_set_skip_callback(a, skip_callback);
+  archive_read_set_callback_data(a, &buffer);
+
+  if (archive_read_open1(a) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+  int entry_count = 0;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK && entry_count < 50) {
+    archive_entry_pathname(entry);
+    archive_entry_size(entry);
+
+    // Read data which may trigger seeks
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+
+    entry_count++;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_seek_fuzzer.options b/contrib/oss-fuzz/libarchive_seek_fuzzer.options
new file mode 100644
index 000000000000..4821a7059b59
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_seek_fuzzer.options
@@ -0,0 +1,3 @@
+[libfuzzer]
+max_len = 262144
+timeout = 30
diff --git a/contrib/oss-fuzz/libarchive_string_fuzzer.cc b/contrib/oss-fuzz/libarchive_string_fuzzer.cc
new file mode 100644
index 000000000000..24731da1c680
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_string_fuzzer.cc
@@ -0,0 +1,144 @@
+/*
+ * Archive string/encoding conversion fuzzer for libarchive
+ * Tests character encoding conversions which are often vulnerability sources
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <wchar.h>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 32 * 1024;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive_entry *entry = archive_entry_new();
+  if (entry == NULL) {
+    return 0;
+  }
+
+  // Reserve some bytes for control
+  if (len < 4) {
+    archive_entry_free(entry);
+    return 0;
+  }
+
+  uint8_t test_type = buf[0];
+  const char *str = reinterpret_cast<const char*>(buf + 1);
+  size_t str_len = len - 1;
+
+  // Ensure null termination for string operations
+  char *safe_str = static_cast<char*>(malloc(str_len + 1));
+  if (safe_str == NULL) {
+    archive_entry_free(entry);
+    return 0;
+  }
+  memcpy(safe_str, str, str_len);
+  safe_str[str_len] = '\0';
+
+  // Test various string functions based on type
+  switch (test_type % 10) {
+    case 0:
+      // Pathname conversions
+      archive_entry_set_pathname(entry, safe_str);
+      archive_entry_pathname(entry);
+      archive_entry_pathname_w(entry);
+      archive_entry_pathname_utf8(entry);
+      break;
+
+    case 1:
+      // Symlink conversions
+      archive_entry_set_symlink(entry, safe_str);
+      archive_entry_symlink(entry);
+      archive_entry_symlink_w(entry);
+      archive_entry_symlink_utf8(entry);
+      break;
+
+    case 2:
+      // Hardlink conversions
+      archive_entry_set_hardlink(entry, safe_str);
+      archive_entry_hardlink(entry);
+      archive_entry_hardlink_w(entry);
+      archive_entry_hardlink_utf8(entry);
+      break;
+
+    case 3:
+      // Username conversions
+      archive_entry_set_uname(entry, safe_str);
+      archive_entry_uname(entry);
+      archive_entry_uname_w(entry);
+      archive_entry_uname_utf8(entry);
+      break;
+
+    case 4:
+      // Group name conversions
+      archive_entry_set_gname(entry, safe_str);
+      archive_entry_gname(entry);
+      archive_entry_gname_w(entry);
+      archive_entry_gname_utf8(entry);
+      break;
+
+    case 5:
+      // Copy functions
+      archive_entry_copy_pathname(entry, safe_str);
+      archive_entry_copy_symlink(entry, safe_str);
+      archive_entry_copy_hardlink(entry, safe_str);
+      break;
+
+    case 6:
+      // UTF-8 specific
+      archive_entry_update_pathname_utf8(entry, safe_str);
+      archive_entry_update_symlink_utf8(entry, safe_str);
+      archive_entry_update_hardlink_utf8(entry, safe_str);
+      break;
+
+    case 7:
+      // Fflags text
+      archive_entry_copy_fflags_text(entry, safe_str);
+      archive_entry_fflags_text(entry);
+      break;
+
+    case 8:
+      // ACL text parsing
+      archive_entry_acl_from_text(entry, safe_str, ARCHIVE_ENTRY_ACL_TYPE_ACCESS);
+      archive_entry_acl_from_text(entry, safe_str, ARCHIVE_ENTRY_ACL_TYPE_DEFAULT);
+      archive_entry_acl_from_text(entry, safe_str, ARCHIVE_ENTRY_ACL_TYPE_NFS4);
+      break;
+
+    case 9: {
+      // Wide character operations
+      size_t wlen = str_len;
+      wchar_t *wstr = static_cast<wchar_t*>(malloc((wlen + 1) * sizeof(wchar_t)));
+      if (wstr) {
+        mbstowcs(wstr, safe_str, wlen);
+        wstr[wlen] = L'\0';
+
+        archive_entry_copy_pathname_w(entry, wstr);
+        archive_entry_pathname_w(entry);
+
+        archive_entry_copy_symlink_w(entry, wstr);
+        archive_entry_symlink_w(entry);
+
+        free(wstr);
+      }
+      break;
+    }
+  }
+
+  // Clone and compare
+  struct archive_entry *entry2 = archive_entry_clone(entry);
+  if (entry2) {
+    archive_entry_free(entry2);
+  }
+
+  free(safe_str);
+  archive_entry_free(entry);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_tar_fuzzer.cc b/contrib/oss-fuzz/libarchive_tar_fuzzer.cc
new file mode 100644
index 000000000000..ef4ce5fe339f
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_tar_fuzzer.cc
@@ -0,0 +1,86 @@
+/*
+ * TAR format fuzzer for libarchive
+ * Tests all TAR variants: ustar, pax, gnutar, v7, oldgnu
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_tar(a);
+  archive_read_support_format_gnutar(a);
+  archive_read_support_filter_all(a);
+
+  // Enable various TAR options
+  archive_read_set_options(a, "tar:read_concatenated_archives,tar:mac-ext");
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    // Exercise all metadata accessors
+    archive_entry_pathname(entry);
+    archive_entry_pathname_w(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_atime(entry);
+    archive_entry_ctime(entry);
+    archive_entry_mode(entry);
+    archive_entry_uid(entry);
+    archive_entry_gid(entry);
+    archive_entry_uname(entry);
+    archive_entry_gname(entry);
+    archive_entry_symlink(entry);
+    archive_entry_hardlink(entry);
+    archive_entry_rdev(entry);
+    archive_entry_devmajor(entry);
+    archive_entry_devminor(entry);
+
+    // Test sparse file handling
+    archive_entry_sparse_reset(entry);
+    int64_t offset, length;
+    while (archive_entry_sparse_next(entry, &offset, &length) == ARCHIVE_OK) {
+      (void)offset;
+      (void)length;
+    }
+
+    // Test xattr handling
+    archive_entry_xattr_reset(entry);
+    const char *name;
+    const void *value;
+    size_t size;
+    while (archive_entry_xattr_next(entry, &name, &value, &size) == ARCHIVE_OK) {
+      (void)name;
+      (void)value;
+      (void)size;
+    }
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_tar_fuzzer.dict b/contrib/oss-fuzz/libarchive_tar_fuzzer.dict
new file mode 100644
index 000000000000..954d54b59c25
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_tar_fuzzer.dict
@@ -0,0 +1,51 @@
+# TAR format dictionary
+
+# USTAR magic
+"ustar"
+"ustar\x00"
+"ustar  \x00"
+
+# GNU tar magic
+"GNUtar "
+"GNUtar\x00"
+
+# Common header field values
+"00000000000"
+"0000644"
+"0000755"
+"0000777"
+
+# Type flags
+"0"
+"1"
+"2"
+"3"
+"4"
+"5"
+"6"
+"7"
+"g"
+"x"
+"L"
+"K"
+
+# PAX keywords
+"path="
+"linkpath="
+"uname="
+"gname="
+"uid="
+"gid="
+"size="
+"mtime="
+"atime="
+"ctime="
+"SCHILY.xattr."
+"LIBARCHIVE.xattr."
+
+# Sparse headers
+"GNU.sparse.major="
+"GNU.sparse.minor="
+"GNU.sparse.name="
+"GNU.sparse.realsize="
+"GNU.sparse.map="
diff --git a/contrib/oss-fuzz/libarchive_warc_fuzzer.cc b/contrib/oss-fuzz/libarchive_warc_fuzzer.cc
new file mode 100644
index 000000000000..2ae7a167f68a
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_warc_fuzzer.cc
@@ -0,0 +1,50 @@
+/*
+ * WARC (Web Archive) format fuzzer for libarchive
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_warc(a);
+  archive_read_support_filter_all(a);
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_warc_fuzzer.dict b/contrib/oss-fuzz/libarchive_warc_fuzzer.dict
new file mode 100644
index 000000000000..ca1d08adf22e
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_warc_fuzzer.dict
@@ -0,0 +1,34 @@
+# WARC format dictionary
+
+# Version
+"WARC/1.0"
+"WARC/1.1"
+"WARC/0.17"
+"WARC/0.18"
+
+# Record types
+"warcinfo"
+"response"
+"resource"
+"request"
+"metadata"
+"revisit"
+"conversion"
+"continuation"
+
+# Headers
+"WARC-Type:"
+"WARC-Record-ID:"
+"WARC-Date:"
+"WARC-Target-URI:"
+"Content-Length:"
+"Content-Type:"
+"WARC-Block-Digest:"
+"WARC-Payload-Digest:"
+"WARC-Concurrent-To:"
+"WARC-Refers-To:"
+
+# Content types
+"application/warc-fields"
+"application/http;msgtype=request"
+"application/http;msgtype=response"
diff --git a/contrib/oss-fuzz/libarchive_write_disk_fuzzer.cc b/contrib/oss-fuzz/libarchive_write_disk_fuzzer.cc
new file mode 100644
index 000000000000..056bd1639550
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_write_disk_fuzzer.cc
@@ -0,0 +1,125 @@
+/*
+ * Archive write disk fuzzer for libarchive
+ * Tests extraction to filesystem
+ * Security-critical: path traversal, permission handling, symlink attacks
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 64 * 1024;
+
+static char g_temp_dir[256] = {0};
+
+extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
+  (void)argc;
+  (void)argv;
+  // Create a temporary directory for extraction
+  snprintf(g_temp_dir, sizeof(g_temp_dir), "/tmp/fuzz_extract_XXXXXX");
+  if (mkdtemp(g_temp_dir) == NULL) {
+    g_temp_dir[0] = '\0';
+  }
+  return 0;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  if (g_temp_dir[0] == '\0') {
+    return 0;
+  }
+
+  DataConsumer consumer(buf, len);
+
+  struct archive *disk = archive_write_disk_new();
+  if (disk == NULL) {
+    return 0;
+  }
+
+  // Configure write disk options
+  uint8_t opt_flags = consumer.consume_byte();
+  int flags = 0;
+  if (opt_flags & 0x01) flags |= ARCHIVE_EXTRACT_TIME;
+  if (opt_flags & 0x02) flags |= ARCHIVE_EXTRACT_PERM;
+  if (opt_flags & 0x04) flags |= ARCHIVE_EXTRACT_ACL;
+  if (opt_flags & 0x08) flags |= ARCHIVE_EXTRACT_FFLAGS;
+  if (opt_flags & 0x10) flags |= ARCHIVE_EXTRACT_OWNER;
+  if (opt_flags & 0x20) flags |= ARCHIVE_EXTRACT_XATTR;
+  if (opt_flags & 0x40) flags |= ARCHIVE_EXTRACT_SECURE_SYMLINKS;
+  if (opt_flags & 0x80) flags |= ARCHIVE_EXTRACT_SECURE_NODOTDOT;
+
+  archive_write_disk_set_options(disk, flags);
+  archive_write_disk_set_standard_lookup(disk);
+
+  // Create entries to extract
+  int entry_count = 0;
+  while (!consumer.empty() && entry_count < 5 && consumer.remaining() > 20) {
+    struct archive_entry *entry = archive_entry_new();
+    if (entry == NULL) break;
+
+    // Build a safe path within our temp directory
+    char safe_path[512];
+    const char *name = consumer.consume_string(32);
+    snprintf(safe_path, sizeof(safe_path), "%s/%s", g_temp_dir, name);
+
+    // Sanitize path to prevent traversal
+    char *p = safe_path;
+    while (*p) {
+      if (p[0] == '.' && p[1] == '.') {
+        p[0] = '_';
+        p[1] = '_';
+      }
+      p++;
+    }
+
+    archive_entry_set_pathname(entry, safe_path);
+
+    uint8_t ftype = consumer.consume_byte() % 3;
+    mode_t mode;
+    switch (ftype) {
+      case 0: mode = S_IFREG | 0644; break;
+      case 1: mode = S_IFDIR | 0755; break;
+      default: mode = S_IFREG | 0644; break;
+    }
+    archive_entry_set_mode(entry, mode);
+
+    archive_entry_set_uid(entry, 1000);
+    archive_entry_set_gid(entry, 1000);
+    archive_entry_set_mtime(entry, consumer.consume_i64(), 0);
+
+    // Write the entry header
+    if (archive_write_header(disk, entry) == ARCHIVE_OK) {
+      if (S_ISREG(mode)) {
+        uint8_t data_buf[256];
+        size_t data_len = consumer.consume_bytes(data_buf, 256);
+        archive_entry_set_size(entry, data_len);
+        if (data_len > 0) {
+          archive_write_data(disk, data_buf, data_len);
+        }
+      }
+      archive_write_finish_entry(disk);
+    }
+
+    archive_entry_free(entry);
+    entry_count++;
+  }
+
+  archive_write_close(disk);
+  archive_write_free(disk);
+
+  // Clean up extracted files using nftw (safer than system())
+  remove_directory_tree(g_temp_dir);
+  // Recreate the temp directory for next iteration
+  mkdir(g_temp_dir, 0700);
+
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_write_disk_fuzzer.options b/contrib/oss-fuzz/libarchive_write_disk_fuzzer.options
new file mode 100644
index 000000000000..1489609db06e
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_write_disk_fuzzer.options
@@ -0,0 +1,3 @@
+[libfuzzer]
+max_len = 65536
+timeout = 30
diff --git a/contrib/oss-fuzz/libarchive_write_fuzzer.cc b/contrib/oss-fuzz/libarchive_write_fuzzer.cc
new file mode 100644
index 000000000000..012c5a4f5596
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_write_fuzzer.cc
@@ -0,0 +1,132 @@
+/*
+ * Archive write fuzzer for libarchive
+ * Tests archive creation and writing code paths
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 64 * 1024;  // 64KB
+
+// Simple data consumer
+
+// Memory write callback
+static std::vector<uint8_t> *g_output = nullptr;
+
+static ssize_t write_callback(struct archive *a, void *client_data, const void *buffer, size_t length) {
+  (void)a;
+  (void)client_data;
+  if (g_output && length > 0) {
+    const uint8_t *buf = static_cast<const uint8_t*>(buffer);
+    g_output->insert(g_output->end(), buf, buf + length);
+  }
+  return length;
+}
+
+static int close_callback(struct archive *a, void *client_data) {
+  (void)a;
+  (void)client_data;
+  return ARCHIVE_OK;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  DataConsumer consumer(buf, len);
+  std::vector<uint8_t> output;
+  g_output = &output;
+
+  struct archive *a = archive_write_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  // Select format based on input
+  uint8_t format_choice = consumer.consume_byte() % 8;
+  switch (format_choice) {
+    case 0: archive_write_set_format_pax_restricted(a); break;
+    case 1: archive_write_set_format_gnutar(a); break;
+    case 2: archive_write_set_format_ustar(a); break;
+    case 3: archive_write_set_format_cpio_newc(a); break;
+    case 4: archive_write_set_format_zip(a); break;
+    case 5: archive_write_set_format_7zip(a); break;
+    case 6: archive_write_set_format_xar(a); break;
+    default: archive_write_set_format_pax(a); break;
+  }
+
+  // Select compression based on input
+  uint8_t filter_choice = consumer.consume_byte() % 6;
+  switch (filter_choice) {
+    case 0: archive_write_add_filter_gzip(a); break;
+    case 1: archive_write_add_filter_bzip2(a); break;
+    case 2: archive_write_add_filter_xz(a); break;
+    case 3: archive_write_add_filter_zstd(a); break;
+    case 4: archive_write_add_filter_none(a); break;
+    default: archive_write_add_filter_none(a); break;
+  }
+
+  // Open for writing to memory
+  if (archive_write_open(a, NULL, NULL, write_callback, close_callback) != ARCHIVE_OK) {
+    archive_write_free(a);
+    g_output = nullptr;
+    return 0;
+  }
+
+  // Create entries based on remaining input
+  int entry_count = 0;
+  while (!consumer.empty() && entry_count < 10 && consumer.remaining() > 20) {
+    struct archive_entry *entry = archive_entry_new();
+    if (entry == NULL) break;
+
+    // Set entry properties
+    archive_entry_set_pathname(entry, consumer.consume_string(64));
+
+    uint8_t ftype = consumer.consume_byte() % 4;
+    mode_t mode;
+    switch (ftype) {
+      case 0: mode = S_IFREG | 0644; break;
+      case 1: mode = S_IFDIR | 0755; break;
+      case 2: mode = S_IFLNK | 0777; break;
+      default: mode = S_IFREG | 0644; break;
+    }
+    archive_entry_set_mode(entry, mode);
+
+    archive_entry_set_uid(entry, consumer.consume_u32() & 0xFFFF);
+    archive_entry_set_gid(entry, consumer.consume_u32() & 0xFFFF);
+    archive_entry_set_mtime(entry, consumer.consume_i64(), 0);
+
+    // For regular files, write some data
+    if (S_ISREG(mode)) {
+      uint8_t data_buf[1024];
+      size_t data_len = consumer.consume_bytes(data_buf, 1024);
+      archive_entry_set_size(entry, data_len);
+
+      if (archive_write_header(a, entry) == ARCHIVE_OK && data_len > 0) {
+        archive_write_data(a, data_buf, data_len);
+      }
+    } else if (S_ISLNK(mode)) {
+      archive_entry_set_symlink(entry, consumer.consume_string(64));
+      archive_entry_set_size(entry, 0);
+      archive_write_header(a, entry);
+    } else {
+      archive_entry_set_size(entry, 0);
+      archive_write_header(a, entry);
+    }
+
+    archive_entry_free(entry);
+    entry_count++;
+  }
+
+  archive_write_close(a);
+  archive_write_free(a);
+  g_output = nullptr;
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_xar_fuzzer.cc b/contrib/oss-fuzz/libarchive_xar_fuzzer.cc
new file mode 100644
index 000000000000..be889643140d
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_xar_fuzzer.cc
@@ -0,0 +1,60 @@
+/*
+ * XAR format specific fuzzer for libarchive
+ * Targets xar_read_header and XAR parsing code paths
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;  // 512KB
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  // Enable XAR format specifically
+  archive_read_support_format_xar(a);
+  // Enable common filters
+  archive_read_support_filter_all(a);
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    // Exercise entry metadata access
+    archive_entry_pathname(entry);
+    archive_entry_pathname_w(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_filetype(entry);
+    archive_entry_uid(entry);
+    archive_entry_gid(entry);
+
+    // Read data
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_xar_fuzzer.dict b/contrib/oss-fuzz/libarchive_xar_fuzzer.dict
new file mode 100644
index 000000000000..1e5d935442ae
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_xar_fuzzer.dict
@@ -0,0 +1,44 @@
+# XAR format dictionary
+# Magic bytes
+"xar!"
+"\x78\x61\x72\x21"
+
+# XML elements commonly in XAR
+"<xar>"
+"</xar>"
+"<toc>"
+"</toc>"
+"<file>"
+"</file>"
+"<name>"
+"</name>"
+"<data>"
+"</data>"
+"<encoding>"
+"</encoding>"
+"<archived-checksum>"
+"<extracted-checksum>"
+"<offset>"
+"<length>"
+"<size>"
+"<mode>"
+"<uid>"
+"<gid>"
+"<user>"
+"<group>"
+"<type>"
+"<mtime>"
+"<atime>"
+"<ctime>"
+
+# Compression types
+"application/octet-stream"
+"application/x-gzip"
+"application/x-bzip2"
+"application/x-lzma"
+
+# Checksum types
+"sha1"
+"md5"
+"sha256"
+"sha512"
diff --git a/contrib/oss-fuzz/libarchive_xar_fuzzer.options b/contrib/oss-fuzz/libarchive_xar_fuzzer.options
new file mode 100644
index 000000000000..d2d9f0ed27d2
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_xar_fuzzer.options
@@ -0,0 +1,10 @@
+[libfuzzer]
+max_len = 524288
+timeout = 60
+rss_limit_mb = 2048
+
+[honggfuzz]
+timeout = 60
+
+[afl]
+timeout = 60
diff --git a/contrib/oss-fuzz/libarchive_zip_fuzzer.cc b/contrib/oss-fuzz/libarchive_zip_fuzzer.cc
new file mode 100644
index 000000000000..15ce1f4855ae
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_zip_fuzzer.cc
@@ -0,0 +1,68 @@
+/*
+ * ZIP format fuzzer for libarchive
+ * Tests ZIP with various compression methods and encryption
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "fuzz_helpers.h"
+
+static constexpr size_t kMaxInputSize = 512 * 1024;
+
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  if (len == 0 || len > kMaxInputSize) {
+    return 0;
+  }
+
+  struct archive *a = archive_read_new();
+  if (a == NULL) {
+    return 0;
+  }
+
+  archive_read_support_format_zip(a);
+  archive_read_support_filter_all(a);
+
+  // Add passphrase for encrypted ZIPs
+  archive_read_add_passphrase(a, "password");
+  archive_read_add_passphrase(a, "test");
+  archive_read_add_passphrase(a, "");
+
+  // Enable ZIP options
+  archive_read_set_options(a, "zip:ignorecrc32");
+
+  Buffer buffer = {buf, len, 0};
+  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
+    archive_read_free(a);
+    return 0;
+  }
+
+  std::vector<uint8_t> data_buffer(4096, 0);
+  struct archive_entry *entry;
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    archive_entry_pathname(entry);
+    archive_entry_pathname_w(entry);
+    archive_entry_size(entry);
+    archive_entry_mtime(entry);
+    archive_entry_mode(entry);
+    archive_entry_is_encrypted(entry);
+    archive_entry_is_data_encrypted(entry);
+    archive_entry_is_metadata_encrypted(entry);
+
+    // Check compression name
+    archive_format_name(a);
+    archive_filter_name(a, 0);
+
+    ssize_t r;
+    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
+      ;
+  }
+
+  archive_read_free(a);
+  return 0;
+}
diff --git a/contrib/oss-fuzz/libarchive_zip_fuzzer.dict b/contrib/oss-fuzz/libarchive_zip_fuzzer.dict
new file mode 100644
index 000000000000..185c6a3fa97d
--- /dev/null
+++ b/contrib/oss-fuzz/libarchive_zip_fuzzer.dict
@@ -0,0 +1,43 @@
+# ZIP format dictionary
+
+# Signatures
+"PK\x03\x04"
+"PK\x01\x02"
+"PK\x05\x06"
+"PK\x06\x06"
+"PK\x06\x07"
+"PK\x07\x08"
+
+# Version needed
+"\x14\x00"
+"\x0a\x00"
+"\x2d\x00"
+"\x3f\x00"
+
+# Compression methods
+"\x00\x00"
+"\x08\x00"
+"\x09\x00"
+"\x0c\x00"
+"\x0e\x00"
+"\x5f\x00"
+
+# General purpose flags
+"\x00\x00"
+"\x01\x00"
+"\x08\x00"
+"\x09\x00"
+
+# Extra field IDs
+"\x01\x00"
+"\x07\x00"
+"\x09\x00"
+"\x0a\x00"
+"\x15\x00"
+"\x17\x00"
+"\x55\x54"
+"\x75\x78"
+
+# Encryption
+"\x01\x99"
+"\x02\x99"
diff --git a/contrib/oss-fuzz/oss-fuzz-build.sh b/contrib/oss-fuzz/oss-fuzz-build.sh
index 83d8470b13f3..16850fe38eff 100755
--- a/contrib/oss-fuzz/oss-fuzz-build.sh
+++ b/contrib/oss-fuzz/oss-fuzz-build.sh
@@ -1,16 +1,131 @@
-# build the project
+#!/bin/bash -eu
+
+# Build the project
 ./build/autogen.sh
 ./configure
 make -j$(nproc) all
 
-# build seed
-cp $SRC/libarchive/contrib/oss-fuzz/corpus.zip\
-       	$OUT/libarchive_fuzzer_seed_corpus.zip
-
-# build fuzzer(s)
-$CXX $CXXFLAGS -Ilibarchive \
-    $SRC/libarchive/contrib/oss-fuzz/libarchive_fuzzer.cc \
-     -o $OUT/libarchive_fuzzer $LIB_FUZZING_ENGINE \
-    .libs/libarchive.a -Wl,-Bstatic -lbz2 -llzo2  \
-    -lxml2 -llzma -lz -lcrypto -llz4 -licuuc \
-    -licudata -Wl,-Bdynamic
+FUZZ_DIR=$SRC/libarchive/contrib/oss-fuzz
+TEST_DIR=$SRC/libarchive/libarchive/test
+
+# Common libraries for linking
+LIBS=".libs/libarchive.a -Wl,-Bstatic -lbz2 -llzo2 -lxml2 -llzma -lz -lcrypto -llz4 -licuuc -licudata -Wl,-Bdynamic"
+
+# Function to build a fuzzer
+build_fuzzer() {
+    local name=$1
+    local source=$2
+    echo "Building fuzzer: $name"
+    $CXX $CXXFLAGS -Ilibarchive \
+        "$source" \
+        -o "$OUT/$name" $LIB_FUZZING_ENGINE $LIBS
+}
+
+# Build all format-specific fuzzers
+FUZZERS=(
+    "libarchive_fuzzer"
+    "libarchive_tar_fuzzer"
+    "libarchive_zip_fuzzer"
+    "libarchive_7zip_fuzzer"
+    "libarchive_rar_fuzzer"
+    "libarchive_rar5_fuzzer"
+    "libarchive_xar_fuzzer"
+    "libarchive_cab_fuzzer"
+    "libarchive_lha_fuzzer"
+    "libarchive_iso9660_fuzzer"
+    "libarchive_cpio_fuzzer"
+    "libarchive_warc_fuzzer"
+    "libarchive_mtree_fuzzer"
+    "libarchive_ar_fuzzer"
+    "libarchive_filter_fuzzer"
+    "libarchive_entry_fuzzer"
+    "libarchive_write_fuzzer"
+    "libarchive_linkify_fuzzer"
+    "libarchive_match_fuzzer"
+    "libarchive_encryption_fuzzer"
+    "libarchive_read_disk_fuzzer"
+    "libarchive_write_disk_fuzzer"
+    "libarchive_seek_fuzzer"
+    "libarchive_string_fuzzer"
+    "libarchive_roundtrip_fuzzer"
+)
+
+for fuzzer in "${FUZZERS[@]}"; do
+    if [ -f "$FUZZ_DIR/${fuzzer}.cc" ]; then
+        build_fuzzer "$fuzzer" "$FUZZ_DIR/${fuzzer}.cc"
+    fi
+done
+
+# Copy dictionaries and options
+cp "$FUZZ_DIR"/*.dict "$OUT/" 2>/dev/null || true
+cp "$FUZZ_DIR"/*.options "$OUT/" 2>/dev/null || true
+
+# Build seed corpora
+echo "Building seed corpora..."
+
+# Main fuzzer corpus (existing)
+cp "$FUZZ_DIR/corpus.zip" "$OUT/libarchive_fuzzer_seed_corpus.zip"
+
+# Function to create corpus from test files
+create_corpus() {
+    local name=$1
+    local pattern=$2
+    local dir="/tmp/${name}_corpus"
+
+    mkdir -p "$dir"
+    for f in $TEST_DIR/$pattern; do
+        if [ -f "$f" ]; then
+            base=$(basename "$f" .uu)
+            uudecode -o "$dir/$base" "$f" 2>/dev/null || true
+        fi
+    done
+
+    if [ "$(ls -A $dir 2>/dev/null)" ]; then
+        zip -j "$OUT/${name}_seed_corpus.zip" "$dir"/* 2>/dev/null || true
+        echo "Created corpus for $name with $(ls $dir | wc -l) files"
+    fi
+    rm -rf "$dir"
+}
+
+# Create format-specific corpora
+create_corpus "libarchive_tar_fuzzer" "test_compat_*tar*.uu"
+create_corpus "libarchive_zip_fuzzer" "test_*zip*.uu"
+create_corpus "libarchive_7zip_fuzzer" "test_read_format_7zip*.uu"
+create_corpus "libarchive_rar_fuzzer" "test_read_format_rar_*.uu"
+create_corpus "libarchive_rar5_fuzzer" "test_read_format_rar5*.uu"
+create_corpus "libarchive_xar_fuzzer" "test_read_format_xar*.uu"
+create_corpus "libarchive_cab_fuzzer" "test_read_format_cab*.uu"
+create_corpus "libarchive_lha_fuzzer" "test_read_format_lha*.uu"
+create_corpus "libarchive_iso9660_fuzzer" "test_read_format_iso*.uu"
+create_corpus "libarchive_cpio_fuzzer" "test_compat_cpio*.uu"
+create_corpus "libarchive_warc_fuzzer" "test_read_format_warc*.uu"
+create_corpus "libarchive_mtree_fuzzer" "test_read_format_mtree*.uu"
+create_corpus "libarchive_ar_fuzzer" "test_read_format_ar*.uu"
+
+# Filter corpus - use compressed test files
+mkdir -p /tmp/filter_corpus
+for f in $TEST_DIR/*.gz.uu $TEST_DIR/*.bz2.uu $TEST_DIR/*.xz.uu $TEST_DIR/*.lz4.uu $TEST_DIR/*.zst.uu $TEST_DIR/*.Z.uu; do
+    if [ -f "$f" ]; then
+        base=$(basename "$f" .uu)
+        uudecode -o "/tmp/filter_corpus/$base" "$f" 2>/dev/null || true
+    fi
+done
+if [ "$(ls -A /tmp/filter_corpus 2>/dev/null)" ]; then
+    zip -j "$OUT/libarchive_filter_fuzzer_seed_corpus.zip" /tmp/filter_corpus/* 2>/dev/null || true
+fi
+rm -rf /tmp/filter_corpus
+
+# Encryption corpus - encrypted archives
+mkdir -p /tmp/encryption_corpus
+for f in $TEST_DIR/*encrypt*.uu $TEST_DIR/*password*.uu; do
+    if [ -f "$f" ]; then
+        base=$(basename "$f" .uu)
+        uudecode -o "/tmp/encryption_corpus/$base" "$f" 2>/dev/null || true
+    fi
+done
+if [ "$(ls -A /tmp/encryption_corpus 2>/dev/null)" ]; then
+    zip -j "$OUT/libarchive_encryption_fuzzer_seed_corpus.zip" /tmp/encryption_corpus/* 2>/dev/null || true
+fi
+rm -rf /tmp/encryption_corpus
+
+echo "Build complete! Built ${#FUZZERS[@]} fuzzers."