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5.3
ClamAV: Malicious HTML file can crash the scanner
CVE-2026-20031
Summary
An attacker can submit a specially crafted HTML file to the ClamAV scanner, causing it to crash. This can happen even without permission. Affected users should update their ClamAV software to fix this issue.
Original title
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...
Original 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.
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.
nvd CVSS3.1
5.3
Vulnerability type
CWE-248
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026