CVE-2026-20348

Name	CVE-2026-20348
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1143939

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
clamav (PTS)	bullseye	0.103.10+dfsg-0+deb11u1	vulnerable
	bullseye (security)	1.4.3+dfsg-1~deb11u1	vulnerable
	bookworm	1.4.3+dfsg-1~deb12u2	vulnerable
	trixie	1.4.3+dfsg-1	vulnerable
	forky, sid	1.4.5+dfsg-3	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
clamav	source	(unstable)	(unfixed)			1143939

[trixie] - clamav <no-dsa> (clamav is being updated via -updates)
https://blog.clamav.net/2026/08/clamav-154-and-146-security-patch.html