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Ubuntu Security NoticesUSN-8788-1

USN-8788-1: ClamAV vulnerabilities

Severity not listed 7 CVEs Published Sep 21, 2026 at 12:05 PM UTC

Summary

It was discovered that ClamAV incorrectly handled certain zip archive files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20337, CVE-2026-20338)

It was discovered that ClamAV incorrectly handled certain PESpin files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20339)

It was discovered that ClamAV incorrectly handled certain GPT files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20345)

It was discovered that ClamAV incorrectly handled certain PDF files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20346)

It was discovered that ClamAV incorrectly handled certain Mach-O files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20347)

It was discovered that ClamAV incorrectly handled certain XAR files. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. (CVE-2026-20348)

Products covered

A separate affected-products list was not included in the collected bulletin.

Remediation

Separate remediation guidance was not included in the collected bulletin.

CVEs in this advisory 7

Updates

  1. Published by Ubuntu

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.