CVE-2026-20031CWE-248

ClamAV CSS Image Parsing Error Handling Denial of Service Vulnerability

Medium · published March 4, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
37.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00439 · 37.1th percentile
Weakness
CWE-248 · Uncaught Exception
Published
2026-03-04T17:17Z
EPSS history
Timeline
  • 04 MAR 17:17Z
    ClamAV CSS Image Parsing Error Handling Denial of Service Vulnerability
    cvelistv5