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.
Published: 2026-03-04
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 05 Mar 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 05 Mar 2026 09:15:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco secure Endpoint
Vendors & Products Cisco
Cisco secure Endpoint

Wed, 04 Mar 2026 17:30:00 +0000

Type Values Removed Values Added
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.
Title ClamAV CSS Image Parsing Error Handling Denial of Service Vulnerability
Weaknesses CWE-248
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Subscriptions

Cisco Secure Endpoint
cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-03-05T15:52:07.708Z

Reserved: 2025-10-08T11:59:15.353Z

Link: CVE-2026-20031

cve-icon Vulnrichment

Updated: 2026-03-05T15:52:03.337Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-04T18:16:16.773

Modified: 2026-03-05T19:39:11.967

Link: CVE-2026-20031

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-17T13:15:19Z

Weaknesses