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ClamAV Cascading Style Sheets Image Parsing Error Handling Denial of Service Vulnerability

🗓️ 04 Mar 2026 16:00:00Reported by CiscoType 
cisco
 cisco🔗 tools.cisco.com👁 6 Views

Unauthenticated attacker can cause denial of service in ClamAV HTML CSS parsing due to UTF-8 error handling.

Related
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB		CVE-2026-20031
4 Mar 202617:17
–attackerkb
Tenable Nessus		Amazon Linux 2023 : clamav1.4, clamav1.4-data, clamav1.4-devel (ALAS2023-2026-1630)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : clamav1.5, clamav1.5-data, clamav1.5-devel (ALAS2023-2026-1631)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : clamav1.4, --advisory ALAS2-2026-3276 (ALAS-2026-3276)
30 Apr 202600:00
–nessus
Tenable Nessus		Cisco Secure Endpoint ClamAV CSS Parsing DoS (cisco-sa-clamav-css-Fn4QSZ)
13 Mar 202600:00
–nessus
Tenable Nessus		openSUSE 16 Security Update : clamav (openSUSE-SU-2026:20479-1)
22 Apr 202600:00
–nessus
Tenable Nessus		SUSE SLES12 Security Update : clamav (SUSE-SU-2026:1324-1)
15 Apr 202600:00
–nessus
Tenable Nessus		SUSE SLED15 / SLES15 / openSUSE 15 Security Update : clamav (SUSE-SU-2026:1325-1)
15 Apr 202600:00
–nessus
Tenable Nessus		Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : ClamAV vulnerability (USN-8207-1)
28 Apr 202600:00
–nessus
Tenable Nessus		Linux Distros Unpatched Vulnerability : CVE-2026-20031
17 Apr 202600:00
–nessus
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04 Mar 2026 16:00Current
6Medium risk
Vulners AI Score6
EPSS0.00042
ClamAV vulnerabilityHTML CSS parsingUTF-8 error handlingdenial of serviceremote attacker
6