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[USN-8207-1] ClamAV vulnerability

Posted on 27 April 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8207-1
April 27, 2026

clamav vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

ClamAV could be made to crash if it opened a specially crafted HTML file.

Software Description:
- clamav: Anti-virus utility for Unix

Details:

It was discovered that ClamAV incorrectly handled certain HTML files. A
remote attacker could possibly use this issue to cause ClamAV to crash,
resulting in a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
clamav 1.4.4+dfsg-0ubuntu0.25.10.1

Ubuntu 24.04 LTS
clamav 1.4.4+dfsg-0ubuntu0.24.04.1

Ubuntu 22.04 LTS
clamav 1.4.4+dfsg-0ubuntu0.22.04.1

This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.

References:
https://ubuntu.com/security/notices/USN-8207-1
CVE-2026-20031

Package Information:
https://launchpad.net/ubuntu/+source/clamav/1.4.4+dfsg-0ubuntu0.25.10.1
https://launchpad.net/ubuntu/+source/clamav/1.4.4+dfsg-0ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/clamav/1.4.4+dfsg-0ubuntu0.22.04.1

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