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Ubuntu Security NoticesUSN-8788-1

USN-8788-1: ClamAV vulnerabilities

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)

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Scope

What the vendor says is affected

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Timeline

When this advisory changed

  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.

Vulnerabilities

CVEs named in this advisory

CVE-2026-20337View CVSS, KEV, EPSS, and threat contextCVE-2026-20338View CVSS, KEV, EPSS, and threat contextCVE-2026-20339View CVSS, KEV, EPSS, and threat contextCVE-2026-20345View CVSS, KEV, EPSS, and threat contextCVE-2026-20346View CVSS, KEV, EPSS, and threat contextCVE-2026-20347View CVSS, KEV, EPSS, and threat contextCVE-2026-20348View CVSS, KEV, EPSS, and threat context
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