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Vulnerability · Published Aug 7, 2026 · Assigned by cisco

CVE-2026-20339ClamAV PESpin File Format Processing Integer Overflow Vulnerability

High 7.5

In plain English

A high-severity integer overflow in Cisco Secure Endpoint from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 53.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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 as a result of 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 integer overflow. 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24clamav1.4.6-r0ALPINE-CVE-2026-20339
Debian:12clamav1.4.6+dfsg-0+deb12u1DEBIAN-CVE-2026-20339
Debian:13clamavno fix listedDEBIAN-CVE-2026-20339
Debian:14clamav1.4.6+dfsg-1DEBIAN-CVE-2026-20339
Ubuntu:22.04:LTSclamav1.5.4+dfsg-0ubuntu0.22.04.1USN-8788-1
Ubuntu:22.04:LTSclamav1.5.4+dfsg-0ubuntu0.22.04.1UBUNTU-CVE-2026-20339
Ubuntu:24.04:LTSclamav1.5.4+dfsg-0ubuntu0.24.04.1USN-8788-1
Ubuntu:24.04:LTSclamav1.5.4+dfsg-0ubuntu0.24.04.1UBUNTU-CVE-2026-20339
Ubuntu:26.04:LTSclamav1.5.4+dfsg-0ubuntu0.26.04.1UBUNTU-CVE-2026-20339
Ubuntu:26.04:LTSclamav1.5.4+dfsg-0ubuntu0.26.04.1USN-8788-1

Affected products (as reported)

VendorProductVersions
Cisco Cisco Secure Endpoint 7.0.56.2.197.3.37.2.136.1.56.3.16.2.57.3.5

Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References