Cisco-Talos/clamav clamav-1.4.3

ClamAV 1.4.3

on GitHub

ClamAV 1.4.3 is a patch release with the following fixes:

• CVE-2025-20260:
  Fixed a possible buffer overflow write bug in the PDF file parser that could
  cause a denial-of-service (DoS) condition or enable remote code execution.

  This issue only affects configurations where both:

  1. The max file-size scan limit is set greater than or equal to 1024MB.
  2. The max scan-size scan limit is set greater than or equal to 1025MB.

  The code flaw was present prior to version 1.0.0, but a change in version
  1.0.0 that enables larger allocations based on untrusted data made it
  possible to trigger this bug.

  This issue affects all currently supported versions. It will be fixed in:

  • 1.4.3
  • 1.0.9

  Thank you to Greg Walkup at Sandia National Labs for identifying this issue.

• CVE-2025-20234:
  Fixed a possible buffer overflow read bug in the UDF file parser that may
  write to a temp file and thus disclose information, or it may crash and
  cause a denial-of-service (DoS) condition.

  This issue was introduced in version 1.2.0. It will be fixed in 1.4.3.

  Thank you to volticks (@movx64 on Twitter/X), working with Trend Micro Zero
  Day Initiative, for identifying this issue.

• Fixed a possible use-after-free bug in the Xz decompression module in the
  bundled lzma-sdk library.

  This issue was fixed in the lzma-sdk version 18.03. ClamAV bundles a copy
  of the lzma-sdk with some performance changes specific to libclamav, plus
  select bug fixes like this one in lieu of a full upgrade to newer lzma-sdk.

  This issue affects all ClamAV versions at least as far back as 0.99.4.
  It will be fixed in:

  • 1.4.3
  • 1.0.9

  Thank you to OSS-Fuzz for identifying this issue.

• Windows: Fixed a build install issue when a DLL dependency such as libcrypto
  has the exact same name as one provided by the Windows operating system.