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[USN-8456-1] libxml2 vulnerability

Posted on 24 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8456-1
June 22, 2026

libxml2 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

libxml2 could be made to crash or run programs if it received specially
crafted input.

Software Description:
- libxml2: GNOME XML library

Details:

Geoffrey Humphreys discovered that libxml2 had a use after free when
parsing the internal subset of a DTD. A remote attacker could possibly use
this issue to cause a denial of service or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 24.04 LTS
libxml2 2.9.14+dfsg-1.3ubuntu3.8
libxml2-dev 2.9.14+dfsg-1.3ubuntu3.8
libxml2-utils 2.9.14+dfsg-1.3ubuntu3.8
python3-libxml2 2.9.14+dfsg-1.3ubuntu3.8

Ubuntu 22.04 LTS
libxml2 2.9.13+dfsg-1ubuntu0.12
libxml2-dev 2.9.13+dfsg-1ubuntu0.12
libxml2-utils 2.9.13+dfsg-1ubuntu0.12
python3-libxml2 2.9.13+dfsg-1ubuntu0.12

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8456-1
CVE-2026-6653

Package Information:
https://launchpad.net/ubuntu/+source/libxml2/2.9.14+dfsg-1.3ubuntu3.8
https://launchpad.net/ubuntu/+source/libxml2/2.9.13+dfsg-1ubuntu0.12

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