CVE-2026-20031
ClamAV CSS Image Parsing Error Handling Denial of Service Vulnerability
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.
Weakness: CWE-248
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Secure Endpoint | Endpoint / EDR | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Secure Endpoint
Vendor advisory
ClamAV Cascading Style Sheets Image Parsing Error Handling Denial of Service Vulnerability
Cisco’s rating: Medium (advisory CVSS 5.3) · Published Mar 4, 2026
Bug IDs: CSCwr70252 , CSCwr70255 , CSCwr70257 , CSCwr70268
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from