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Vulnerability · Published Aug 7, 2026 · Assigned by cisco

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

High 7.5

In plain English

A high-severity buffer 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 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 45.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24clamav1.4.6-r0ALPINE-CVE-2026-20348
Debian:12clamav1.4.6+dfsg-0+deb12u1DEBIAN-CVE-2026-20348
Debian:13clamavno fix listedDEBIAN-CVE-2026-20348
Debian:14clamav1.4.6+dfsg-1DEBIAN-CVE-2026-20348
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-2026-20348
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-2026-20348
Ubuntu:26.04:LTSclamav1.5.4+dfsg-0ubuntu0.26.04.1UBUNTU-CVE-2026-20348
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-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References