CVE-2026-20213

A vulnerability in the PE file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in PE files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains PE content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

A vulnerability in the PE file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in PE files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains PE content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

A vulnerability in the PE file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device.

This vulnerability is due to improper boundary checks for content in PE files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains PE content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

• SECURITY UPDATE: Out-of-bounds write in the PE rebuilder via crafted Aspack files
  • debian/patches/CVE-2026-20213.patch: sum rebuilt section sizes in a 64-bit accumulator and reject allocations larger than CLI_MAX_ALLOCATION in libclamav/rebuildpe.c
  • CVE-2026-20213
• SECURITY UPDATE: Out-of-bounds write in the FSG unpacker
  • debian/patches/CVE-2026-20214.patch: fix the FSG v1.31 section loop bound so a zero section count no longer underflows in libclamav/pe.c
  • CVE-2026-20214
• SECURITY UPDATE: Integer overflow in the DMG mish stripe size checks
  • debian/patches/CVE-2026-20244.patch: compute the mish table size in a 64-bit domain and keep the DMG range checks in subtraction form in libclamav/dmg.c
  • CVE-2026-20244

• CVE-2026-20213: fix Aspack-triggered PE rebuild integer overflow leading to heap buffer overflow write
• CVE-2026-20214: fix FSG unpacker section loop underflow leading to out-of-bounds write
• CVE-2026-20215: fix 7z substream count overflow leading to heap under-allocation and out-of-bounds write
• CVE-2026-20216: enforce InstallShield extraction limits to prevent temporary storage exhaustion
• CVE-2026-20217: fix PESpin unpacker cleanup bitmap tracking leading to invalid free and crash
• CVE-2026-20243: fix ALZ archive parser out-of-bounds write and scan-limit bypass

• CVE-2026-20213: fix Aspack-triggered PE rebuild integer overflow leading to heap buffer overflow write
• CVE-2026-20214: fix FSG unpacker section loop underflow leading to out-of-bounds write
• CVE-2026-20215: fix 7z substream count overflow leading to heap under-allocation and out-of-bounds write
• CVE-2026-20216: enforce InstallShield extraction limits to prevent temporary storage exhaustion
• CVE-2026-20217: fix PESpin unpacker cleanup bitmap tracking leading to invalid free and crash

The updated packages fix security vulnerabilities: PE File Format Processing Out-of-Bounds Memory Corruption Vulnerability. (CVE-2026-20213) FSG File Format Processing Out-of-Bounds Memory Corruption Vulnerability. (CVE-2026-20214) 7Zip File Format Processing Out-of-Bounds Memory Corruption Vulnerability. (CVE-2026-20215) InstallShield File Format Processing Resource Exhaustion Vulnerability. (CVE-2026-20216) PESpin File Format Processing Out-of-Bounds Memory Corruption Vulnerability. (CVE-2026-20217) ALZ Archive Processing Denial of Service Vulnerability. (CVE-2026-20243) DMG File Processing Denial of Service Vulnerability. (CVE-2026-20244)

These are all security issues fixed in the clamav-1.5.3-1.1 package on the GA media of openSUSE Tumbleweed.

This update for clamav fixes the following issues:

Update to version 1.5.3.

Security issues fixed:

• CVE-2026-20213: out-of-bounds write due to improper boundary checks for content in PE files during scanning (bsc#1270107).
• CVE-2026-20214: out-of-bounds write due to improper boundary checks for content in FSG files during scanning (bsc#1270085).
• CVE-2026-20215: out-of-bounds write due to improper boundary checks for content in 7z files during scanning (bsc#1270088).
• CVE-2026-20216: denial of service due to improper handling of temporary resources during InstallShield file scanning (bsc#1270089).
• CVE-2026-20217: out-of-bounds write due to improper boundary checks for content in PESpin files during scanning (bsc#1270091).
• CVE-2026-20243: out-of-bounds write due to improper boundary checks for content in ALZ files during scanning (bsc#1270092).
• CVE-2026-20244: integer overflow and DoS due to improper boundary checks for content in DMG files during scanning (bsc#1270106).
• CVE-2026-41676: buffer overflow due to missing checks via Deriver:derive, PkeyCtxRef:derive and OpenSSL 1.1.1 (bsc#1270138).

Other updates and bugfixes:

• Version 1.5.3:

• Fixed a bug in the PESpin unpacker cleanup path that could free pointers into the scanned file buffer and crash the scanner.
• Fixed an integer overflow in PE rebuild size calculations that could be reached through a malformed Aspack-packed PE file and lead to a heap buffer overflow write.
• Fixed an InstallShield archive extraction limit bypass that could write far more temporary data than intended and exhaust temporary storage.
• Fixed an FSG unpacker loop underflow that could write past the section array while scanning a malformed PE file.
• Fixed ALZ parser size handling bugs that could cause malformed ALZ archives to panic, abort the scanner, or skip expected scan-limit handling.
• Fixed a 7z parser substream count overflow that could under-allocate parser metadata arrays and write past them while reading a malformed archive.
• Fixed 32-bit DMG parser size checks that could let a short mish stripe table pass validation and crash 32-bit scanner builds.
• Hardened clamscan, clamdscan, and clamonacc quarantine actions against time-of-check/time-of-use races that could redirect copied, moved, or removed files under unsafe quarantine directory configurations.
• Upgraded the Rust tar dependency to resolve the RUSTSEC-2026-0067 and RUSTSEC-2026-0068 advisories, and upgraded the Rust openssl dependency to resolve CVE-2026-41676.
• Raised the minimum required CMake version to 3.17 to fix Linux builds with libcurl v8.21.0 when linking static library dependencies.
• Metadata preclass scans now run before the final scan verdict.
• ClamOnAcc: Fixed errors when recursively excluded paths are children of an included path.
• ClamOnAcc: Fixed hash bucket list corruption when two watched paths collide in the same bucket.

This update for clamav fixes the following issues:

Update to version 1.5.3.

Security issues fixed:

• CVE-2026-20213: out-of-bounds write due to improper boundary checks for content in PE files during scanning (bsc#1270107).
• CVE-2026-20214: out-of-bounds write due to improper boundary checks for content in FSG files during scanning (bsc#1270085).
• CVE-2026-20215: out-of-bounds write due to improper boundary checks for content in 7z files during scanning (bsc#1270088).
• CVE-2026-20216: denial of service due to improper handling of temporary resources during InstallShield file scanning (bsc#1270089).
• CVE-2026-20217: out-of-bounds write due to improper boundary checks for content in PESpin files during scanning (bsc#1270091).
• CVE-2026-20243: out-of-bounds write due to improper boundary checks for content in ALZ files during scanning (bsc#1270092).
• CVE-2026-20244: integer overflow and DoS due to improper boundary checks for content in DMG files during scanning (bsc#1270106).
• CVE-2026-41676: buffer overflow due to missing checks via Deriver:derive, PkeyCtxRef:derive and OpenSSL 1.1.1 (bsc#1270138).

Other updates and bugfixes:

• Version 1.5.3:

• Fixed a bug in the PESpin unpacker cleanup path that could free pointers into the scanned file buffer and crash the scanner.
• Fixed an integer overflow in PE rebuild size calculations that could be reached through a malformed Aspack-packed PE file and lead to a heap buffer overflow write.
• Fixed an InstallShield archive extraction limit bypass that could write far more temporary data than intended and exhaust temporary storage.
• Fixed an FSG unpacker loop underflow that could write past the section array while scanning a malformed PE file.
• Fixed ALZ parser size handling bugs that could cause malformed ALZ archives to panic, abort the scanner, or skip expected scan-limit handling.
• Fixed a 7z parser substream count overflow that could under-allocate parser metadata arrays and write past them while reading a malformed archive.
• Fixed 32-bit DMG parser size checks that could let a short mish stripe table pass validation and crash 32-bit scanner builds.
• Hardened clamscan, clamdscan, and clamonacc quarantine actions against time-of-check/time-of-use races that could redirect copied, moved, or removed files under unsafe quarantine directory configurations.
• Upgraded the Rust tar dependency to resolve the RUSTSEC-2026-0067 and RUSTSEC-2026-0068 advisories, and upgraded the Rust openssl dependency to resolve CVE-2026-41676.
• Raised the minimum required CMake version to 3.17 to fix Linux builds with libcurl v8.21.0 when linking static library dependencies.
• Metadata preclass scans now run before the final scan verdict.
• ClamOnAcc: Fixed errors when recursively excluded paths are children of an included path.
• ClamOnAcc: Fixed hash bucket list corruption when two watched paths collide in the same bucket.

This update for clamav fixes the following issues

• CVE-2026-20213: PE file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270107).
• CVE-2026-20214: FSG file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270085).
• CVE-2026-20215: 7z file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270088).
• CVE-2026-20216: InstallShield file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270089).
• CVE-2026-20217: PESpin file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270091).
• CVE-2026-20243: ALZ file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270092).
• CVE-2026-20244: DMG file format parser could allow an unauthenticated, remote attacker to cause a denial of service on 32-bit platforms only (bsc#1270106).
• CVE-2026-41676: rust-openssl: Deriver:derive and PkeyCtxRef:derive can overflow short buffers on OpenSSL 1.1.1 (bsc#1270138).

Changes for clamav:

• Update to 1.5.3:

  • Hardened clamscan, clamdscan, and clamonacc quarantine actions against time-of-check/time-of-use races that could redirect copied, moved, or removed files under unsafe quarantine directory configurations.
  • Raised the minimum required CMake version to 3.17 to fix Linux builds with libcurl v8.21.0 when linking static library dependencies.
  • Metadata preclass scans now run before the final scan verdict.
  • ClamOnAcc: Fixed errors when recursively excluded paths are children of an included path.
  • ClamOnAcc: Fixed hash bucket list corruption when two watched paths collide in the same bucket.

This update for clamav fixes the following issues

• CVE-2026-20213: PE file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270107).
• CVE-2026-20214: FSG file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270085).
• CVE-2026-20215: 7z file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270088).
• CVE-2026-20216: InstallShield file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270089).
• CVE-2026-20217: PESpin file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270091).
• CVE-2026-20243: ALZ file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270092).
• CVE-2026-20244: DMG file format parser could allow an unauthenticated, remote attacker to cause a denial of service on 32-bit platforms only (bsc#1270106).
• CVE-2026-41676: rust-openssl: Deriver:derive and PkeyCtxRef:derive can overflow short buffers on OpenSSL 1.1.1 (bsc#1270138).

Changes for clamav:

• Update to 1.5.3:

  • Hardened clamscan, clamdscan, and clamonacc quarantine actions against time-of-check/time-of-use races that could redirect copied, moved, or removed files under unsafe quarantine directory configurations.
  • Raised the minimum required CMake version to 3.17 to fix Linux builds with libcurl v8.21.0 when linking static library dependencies.
  • Metadata preclass scans now run before the final scan verdict.
  • ClamOnAcc: Fixed errors when recursively excluded paths are children of an included path.
  • ClamOnAcc: Fixed hash bucket list corruption when two watched paths collide in the same bucket.

This update for clamav fixes the following issues

• CVE-2026-20213: PE file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270107).
• CVE-2026-20214: FSG file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270085).
• CVE-2026-20215: 7z file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270088).
• CVE-2026-20216: InstallShield file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270089).
• CVE-2026-20217: PESpin file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270091).
• CVE-2026-20243: ALZ file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270092).
• CVE-2026-20244: DMG file format parser could allow an unauthenticated, remote attacker to cause a denial of service on 32-bit platforms only (bsc#1270106).
• CVE-2026-41676: rust-openssl: Deriver:derive and PkeyCtxRef:derive can overflow short buffers on OpenSSL 1.1.1 (bsc#1270138).

Changes for clamav:

• Update to 1.5.3:

  • Hardened clamscan, clamdscan, and clamonacc quarantine actions against time-of-check/time-of-use races that could redirect copied, moved, or removed files under unsafe quarantine directory configurations.
  • Raised the minimum required CMake version to 3.17 to fix Linux builds with libcurl v8.21.0 when linking static library dependencies.
  • Metadata preclass scans now run before the final scan verdict.
  • ClamOnAcc: Fixed errors when recursively excluded paths are children of an included path.
  • ClamOnAcc: Fixed hash bucket list corruption when two watched paths collide in the same bucket.

This update for clamav fixes the following issues

• CVE-2026-20213: PE file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270107).
• CVE-2026-20214: FSG file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270085).
• CVE-2026-20215: 7z file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270088).
• CVE-2026-20216: InstallShield file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270089).
• CVE-2026-20217: PESpin file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270091).
• CVE-2026-20243: ALZ file format parser could allow an unauthenticated, remote attacker to cause a denial of service (bsc#1270092).
• CVE-2026-20244: DMG file format parser could allow an unauthenticated, remote attacker to cause a denial of service on 32-bit platforms only (bsc#1270106).
• CVE-2026-41676: rust-openssl: Deriver:derive and PkeyCtxRef:derive can overflow short buffers on OpenSSL 1.1.1 (bsc#1270138).

Changes for clamav:

• update to 1.5.3:

• Hardened clamscan, clamdscan, and clamonacc quarantine actions against time-of-check/time-of-use races that could redirect copied, moved, or removed files under unsafe quarantine directory configurations.
• Raised the minimum required CMake version to 3.17 to fix Linux builds with libcurl v8.21.0 when linking static library dependencies.
• Metadata preclass scans now run before the final scan verdict.
• ClamOnAcc: Fixed errors when recursively excluded paths are children of an included path.
• ClamOnAcc: Fixed hash bucket list corruption when two watched paths collide in the same bucket.

It was discovered that ClamAV incorrectly handled certain PE files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20213, CVE-2026-20214, CVE-2026-20217)

It was discovered that ClamAV incorrectly handled certain 7z archive files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20215)

It was discovered that ClamAV incorrectly handled extraction limits for certain InstallShield archives. A remote attacker could possibly use this issue to cause ClamAV to use excessive resources, leading to a denial of service. (CVE-2026-20216)

It was discovered that ClamAV incorrectly handled certain ALZ archive files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20243)

It was discovered that ClamAV incorrectly handled certain DMG files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20244)