CVE-2026-20217 ClamAV PESpin File Format Processing Out-of-Bounds Memory Corruption Vulnerability
An unauthenticated remote attacker can cause a denial of service by submitting a crafted PESpin file that triggers out-of-bounds memory corruption in ClamAV.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-20217?
CVE-2026-20217 is a high-severity memory corruption vulnerability in Clamav Clamav, published on 1 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-120
Which versions are affected by CVE-2026-20217?
It affects 2 products.
Products include Cisco Secure Endpoint, Clamav Clamav.
How do I fix CVE-2026-20217?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-20217 being exploited?
There is no known exploitation of CVE-2026-20217 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Clamav Clamav
- CVE-2023-20032 Memory corruption in Cisco Secure Endpoint
- CVE-2022-20770 ClamAV CHM File Parsing Denial of Service Vulnerability Affecting Cisco Products: April 2022
- CVE-2026-20348 ClamAV XAR File Format Processing Memory Corruption Vulnerability
- CVE-2026-20213 ClamAV PE File Format Processing Out-of-Bounds Memory Corruption Vulnerability
- CVE-2026-20214 ClamAV FSG File Format Processing Out-of-Bounds Memory Corruption Vulnerability
Sources
Also known as AZL-92175, DEBIAN-CVE-2026-20217, GHSA-34f3-w8ff-r2xx, MINI-gpwf-35g3-2f87, MINI-jg3c-5957-x8m8, UBUNTU-CVE-2026-20217.