Secure Endpoint and ClamAV
CVE-2026-20031: ClamAV CSS Image Parsing Error Handling Denial of Service Vulnerability
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.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 5.3
EPSS0.43%Chance of exploitation in 30 days
Public exploitNot tracked
FixNot yet
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Cisco Secure Endpoint 7.0 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 6.1 | See the advisory |
| Cisco Secure Endpoint 6.3 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 7.1 | See the advisory |
| Cisco Secure Endpoint 6.3 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 6.1 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 7.1 | See the advisory |
| Cisco Secure Endpoint 6.3 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 6.2 | See the advisory |
| Cisco Secure Endpoint 6.1 | See the advisory |
| Cisco Secure Endpoint 6.0 | See the advisory |
| Cisco Secure Endpoint 7.2 | See the advisory |
| Cisco Secure Endpoint 6.0 | See the advisory |
| Cisco Secure Endpoint 6.3 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.8 | See the advisory |
| Cisco Secure Endpoint 1.11 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.10 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.8 | See the advisory |
| Cisco Secure Endpoint 1.10 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.14 | See the advisory |
| Cisco Secure Endpoint 1.10 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.6 | See the advisory |
| Cisco Secure Endpoint 1.9 | See the advisory |
| Cisco Secure Endpoint 1.11 | See the advisory |
| Cisco Secure Endpoint 1.7 | See the advisory |
| Cisco Secure Endpoint 1.13 | See the advisory |
| Cisco Secure Endpoint 1.8 | See the advisory |
| Cisco Secure Endpoint 1.13 | See the advisory |
| Cisco Secure Endpoint 1.9 | See the advisory |
| Cisco Secure Endpoint 1.12 | See the advisory |
| Cisco Secure Endpoint 1.13 | See the advisory |
| Cisco Secure Endpoint 2.0 | See the advisory |
| Cisco Secure Endpoint 1.1 | See the advisory |
| Cisco Secure Endpoint 2.0 | See the advisory |
| Cisco Secure Endpoint 2.0 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 2.1 | See the advisory |
| Cisco Secure Endpoint 2.2 | See the advisory |
| Cisco Secure Endpoint 2.3 | See the advisory |
| Cisco Secure Endpoint 2.4 | See the advisory |
| Cisco Secure Endpoint 2.5 | See the advisory |
| Cisco Secure Endpoint 2.6 | See the advisory |
| Cisco Secure Endpoint 2.7 | See the advisory |
| Cisco Secure Endpoint 2.8 | See the advisory |
| Cisco Secure Endpoint 2.9 | See the advisory |
| Cisco Secure Endpoint 2.10 | See the advisory |
| Cisco Secure Endpoint 2.10 | See the advisory |
| Cisco Secure Endpoint 2.11 | See the advisory |
| Cisco Secure Endpoint 1.14 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.16 | See the advisory |
| Cisco Secure Endpoint 1.16 | See the advisory |
| Cisco Secure Endpoint 1.16 | See the advisory |
| Cisco Secure Endpoint 1.16 | See the advisory |
| Cisco Secure Endpoint 1.18 | See the advisory |
| Cisco Secure Endpoint 1.18 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.21 | See the advisory |
| Cisco Secure Endpoint 1.21 | See the advisory |
| Cisco Secure Endpoint 1.21 | See the advisory |
| Cisco Secure Endpoint 1.21 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.22 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.26 | See the advisory |
| Cisco Secure Endpoint 1.24 | See the advisory |
| Cisco Secure Endpoint 1.26 | See the advisory |
| Cisco Secure Endpoint 1.27 | See the advisory |
| Cisco Secure Endpoint 1.15 | See the advisory |
| Cisco Secure Endpoint 1.17 | See the advisory |
| Cisco Secure Endpoint 1.17 | See the advisory |
| Cisco Secure Endpoint 1.17 | See the advisory |
| Cisco Secure Endpoint 1.19 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.23 | See the advisory |
| Cisco Secure Endpoint 1.23 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.20 | See the advisory |
| Cisco Secure Endpoint 1.25 | See the advisory |
| Cisco Secure Endpoint 1.25 | See the advisory |
| Cisco Secure Endpoint 1.25 | See the advisory |
| Cisco Secure Endpoint 1.27 | See the advisory |
| Cisco Secure Endpoint 1.27 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 7.3 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.4 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.0 | See the advisory |
| Cisco Secure Endpoint 8.0 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.1 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.2 | See the advisory |
| Cisco Secure Endpoint 8.2 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.2 | See the advisory |
| Cisco Secure Endpoint 8.2 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
| Cisco Secure Endpoint 7.5 | See the advisory |
| Cisco Secure Endpoint 8.4 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
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.
Exploitation
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.