CVE-2026-20348 ClamAV XAR File Format Processing Memory Corruption Vulnerability

High 7.5 Published 7 Aug 2026 Updated 7 Aug 2026

An unauthenticated remote attacker can cause a denial of service or potentially execute code by submitting a crafted XAR file to ClamAV for scanning.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-20348?

CVE-2026-20348 is a high-severity memory corruption vulnerability in Cisco Secure Endpoint, published on 7 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the XAR 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 XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR 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-2026-20348?

It affects 1 product.

Products include Cisco Secure Endpoint.

How do I fix CVE-2026-20348?

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-2026-20348 being exploited?

There is no known exploitation of CVE-2026-20348 in the wild and no public exploit code.

Sources

Also known as AZL-95441, DEBIAN-CVE-2026-20348, GHSA-r446-3hx7-79p2, UBUNTU-CVE-2026-20348.