Denial of Service Vulnerability in ClamAV Affects openSUSE and Fedora Systems

A security update for ClamAV version 1.5.2 addresses a denial of service vulnerability identified as CVE-2026-20031. This vulnerability arises from improper error handling in the HTML CSS module when processing UTF-8 strings, potentially allowing attackers to exploit crafted HTML files. Affected systems include openSUSE Leap 15.4 and Fedora 37. The update also includes fixes for other issues, such as an infinite loop when scanning JPEG files and a crash caused by invalid pointer alignment. Users are advised to apply the updates using recommended installation methods like YaST or zypper patch. The vulnerability was published on March 4, 2026, and has a CVSS score of 6.9, indicating a medium severity level. This update is crucial for maintaining the security of systems running ClamAV.

Key Points: • CVE-2026-20031 allows denial of service via crafted HTML files. • Affected systems include openSUSE Leap 15.4 and Fedora 37. • Users should apply the ClamAV update to mitigate the vulnerability.