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CVE-2026-20031

ClamAV CSS Image Parsing Error Handling Denial of Service Vulnerability

MEDIUM

5.3

CVSS Score

Published: March 4, 2026 at 05:17 PM UTC

Updated: June 17, 2026 at 10:16 AM UTC

1 product affected across 1 vendorSecure Endpoint

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Secure Endpoint · Cisco

60%

1.1.0 1.10.0 1.10.1 1.10.2 1.11.0 1.11.1 1.12.0 1.12.1 1.12.2 1.12.3 1.12.4 1.12.5 1.12.6 1.12.7 1.13.0 1.13.1 1.13.2 1.14.0 1.14.1 1.15.0 1.15.1 1.15.2 1.15.3 1.15.4 1.15.5 1.15.6 1.16.0 1.16.1 1.16.2 1.16.3 1.17.0 1.17.1 1.17.2 1.18.0 1.18.1 1.19.0 1.20.0 1.20.1 1.20.2 1.20.3 1.20.4 1.20.5 1.20.6 1.20.7 1.20.8 1.21.0 1.21.1 1.21.2 1.21.3 1.22.0 1.22.1 1.22.2 1.22.3 1.22.4 1.23.0 1.23.1 1.24.0 1.24.1 1.24.2 1.24.3 1.24.4 1.24.5 1.25.0 1.25.1 1.25.2 1.26.0 1.26.1 1.27.0 1.27.1 1.27.2 1.6.0 1.7.0 1.8.0 1.8.1 1.8.4 1.9.0 1.9.1 2.0.0 2.0.1 2.0.2 2.1.0.14 2.10.0 2.10.1 2.11.0 2.2.0 2.3.0 2.4.0 2.5.0 2.6.0 2.7.0 2.8.0 2.9.0 6.0.7 6.0.9 6.1.5 6.1.7 6.1.9 6.2.1 6.2.19 6.2.3 6.2.5 6.2.9 6.3.1 6.3.3 6.3.5 6.3.7 7.0.5 7.1.1 7.1.5 7.2.11 7.2.13 7.2.3 7.2.5 7.2.7 7.3.1 7.3.13 7.3.15 7.3.3 7.3.5 7.3.9 7.4.1 7.4.1.20425 7.4.1.20439 7.4.3 7.4.3.20679 7.4.5 7.5.1.20813 7.5.1.20833 7.5.11 7.5.13.21586 7.5.13.21598 7.5.15.21611 7.5.17.21680 7.5.19 7.5.20 7.5.21.21732 7.5.3 7.5.5 7.5.7 7.5.9 8.0.1.21160 8.0.1.21164 8.1.3 8.1.3.21242 8.1.5 8.1.5.21322 8.1.7 8.1.7.21417 8.1.7.21512 8.1.7.21585 8.2.1.21612 8.2.1.21650 8.2.3.30119 8.2.4.30130 8.4.0 8.4.1.30298 8.4.1.30307 8.4.2.30317 8.4.3 8.4.4.30419 8.4.4.30467 8.4.5.30483

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMcisco

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: LOW

Vector?

Quick Info

StatusUNDERGOING ANALYSIS

CWE

CWE-248

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