| Name | CVE-2026-20031 |
| Description | A vulnerability in the HTML Cascading Style Sheets (CSS) module of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to improper error handling when splitting UTF-8 strings. An attacker could exploit this vulnerability by submitting a crafted HTML file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the scanning process. |
| 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) |
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 | 1.4.4+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| clamav | source | (unstable) | 1.4.4+dfsg-1 | | | |
Notes
[trixie] - clamav <no-dsa> (clamav is updated via -updates)
[bookworm] - clamav <no-dsa> (clamav is updated via -updates)
[bullseye] - clamav <postponed> (Minor issue; backport with stable release updates)
https://blog.clamav.net/2026/03/clamav-152-and-144-security-patch.html