USN-8517-1: ClamAV vulnerabilities
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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Details
Original advisory: https://ubuntu.com/security/notices/USN-8517-1
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-202130.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all scored CVEs.
- Low exploitation riskCVE-2026-202140.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 37% of all scored CVEs.
- Low exploitation riskCVE-2026-202170.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.
- Low exploitation riskCVE-2026-202150.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.
- Low exploitation riskCVE-2026-202160.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.
- Low exploitation riskCVE-2026-202430.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.
- Low exploitation riskCVE-2026-202440.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-20213 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20214 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20217 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20215 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20216 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20243 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20244 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[UPDATE] [medium] ClamAV: Multiple vulnerabilitiescert-bund
- highClamAV Vulnerabilities Affecting Cisco Products: July 2026cisco-psirt
- highCVE-2026-20244: ClamAV DMG File Processing Denial of Service Vulnerabilitymsrc
- highCVE-2026-20214: ClamAV FSG File Format Processing Out-of-Bounds Memory Corruption Vulnerabilitymsrc
- highCVE-2026-20215: ClamAV 7Zip File Format Processing Out-of-Bounds Memory Corruption Vulnerabilitymsrc
- highCVE-2026-20216: ClamAV InstallShield File Format Processing Resource Exhaustion Vulnerabilitymsrc
- highCVE-2026-20217: ClamAV PESpin File Format Processing Out-of-Bounds Memory Corruption Vulnerabilitymsrc
- highCVE-2026-20213: ClamAV PE File Format Processing Out-of-Bounds Memory Corruption Vulnerabilitymsrc
- highCVE-2026-20243: ClamAV ALZ Archive Processing Denial of Service Vulnerabilitymsrc
- unknownMultiple vulnerabilities in Cisco products (July 2, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in ClamAV (July 2, 2026)cert-fr-avis
- highCVE-2026-20244: A vulnerability in the DMG file format parser of ClamAV could allow an unauthenticated, remote…nvd
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