Is CVE-2026-20031 actively exploited?

No active exploitation of CVE-2026-20031 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-20031 be exploited remotely?

Yes. CVE-2026-20031 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-20031?

CVE-2026-20031 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-20031

CWE-248Published: March 4, 2026· Updated: Mar 5, 2026

5.3

CVSS v3.1

EPSS:0.09%probability of exploitation in 30 daysPercentile:26.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-20031 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.