CVE-2026-20244
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)
CSIRTS triage
- What
- ClamAV could crash due to improper handling of certain files.
- Who is affected
- Users of ClamAV.
- Urgency
- Remediation is important to prevent denial of service.
- Action
- Update to the latest version of ClamAV.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.
Advisory coverage (8)
- medium[UPDATE] [medium] ClamAV: Multiple vulnerabilitiescert-bund · 2026-07-10
- unknownUSN-8517-1: ClamAV vulnerabilitiesubuntu · 2026-07-08
- highClamAV Vulnerabilities Affecting Cisco Products: July 2026cisco-psirt · 2026-07-02
- highCVE-2026-20244: ClamAV DMG File Processing Denial of Service Vulnerabilitymsrc · 2026-07-02
- unknownMultiple vulnerabilities in Cisco products (July 2, 2026)cert-fr-avis · 2026-07-02
- unknownMultiple vulnerabilities in ClamAV (July 2, 2026)cert-fr-avis · 2026-07-02
- highCVE-2026-20244: A vulnerability in the DMG file format parser of ClamAV could allow an unauthenticated, remote…nvd · 2026-07-01
- highCisco Advance Notification for Publication of July 1, 2026, Security Advisoriescisco-psirt · 2026-07-01
External references
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