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[USN-8517-1] ClamAV vulnerabilities

Posted on 08 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8517-1
July 08, 2026

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

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in ClamAV.

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

Details:

It was discovered that ClamAV incorrectly handled certain PE files. A
remote attacker could possibly use this issue to cause ClamAV to crash,
resulting in a denial of service. (CVE-2026-20213, CVE-2026-20214,
CVE-2026-20217)

It was discovered that ClamAV incorrectly handled certain 7z archive
files. A remote attacker could possibly use this issue to cause ClamAV to
crash, resulting in a denial of service. (CVE-2026-20215)

It was discovered that ClamAV incorrectly handled extraction limits for
certain InstallShield archives. A remote attacker could possibly use this
issue to cause ClamAV to use excessive resources, leading to a denial of
service. (CVE-2026-20216)

It was discovered that ClamAV incorrectly handled certain ALZ archive
files. A remote attacker could possibly use this issue to cause ClamAV to
crash, resulting in a denial of service. (CVE-2026-20243)

It was discovered that ClamAV incorrectly handled certain DMG files. A
remote attacker could possibly use this issue to cause ClamAV to crash,
resulting in a denial of service. (CVE-2026-20244)

Update instructions:

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

Ubuntu 26.04 LTS
clamav 1.5.3+dfsg-0ubuntu0.26.04.1

Ubuntu 24.04 LTS
clamav 1.5.3+dfsg-0ubuntu0.24.04.1

Ubuntu 22.04 LTS
clamav 1.5.3+dfsg-0ubuntu0.22.04.2

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-8517-1
CVE-2026-20213, CVE-2026-20214, CVE-2026-20215, CVE-2026-20216,
CVE-2026-20217, CVE-2026-20243, CVE-2026-20244

Package Information:
https://launchpad.net/ubuntu/+source/clamav/1.5.3+dfsg-0ubuntu0.26.04.1
https://launchpad.net/ubuntu/+source/clamav/1.5.3+dfsg-0ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/clamav/1.5.3+dfsg-0ubuntu0.22.04.2

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