CVE-2026-20217
ClamAV PESpin File Format Processing Out-of-Bounds Memory Corruption Vulnerability
- Published
- Jul 1, 2026
- Updated
- Jul 1, 2026
- Assigning CNA
- cisco
- Evidence observed
- Aug 18, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLow · next 30 days
- Percentile
- 45.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in PESpin files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains PESpin content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.
Sources
1- CVE-2026-20217Exploit
Reproduces ZendTo unauthenticated ClamAV RCE and root privilege escalation in an authorized lab, with pinned Docker target, fail-closed verification, nonce-bound output, and cleanup.
Responsible use
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