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[USN-7743-1] libxml2 vulnerability

Posted on 10 September 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7743-1
September 10, 2025

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

- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

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

Software Description:
- libxml2: GNOME XML library

Details:

Nikita Sveshnikov discovered that libxml2 incorrectly handled recursion
when processing XPath expressions. An attacker could possibly use this
issue to cause a denial of service.

Update instructions:

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

Ubuntu 25.04
libxml2 2.12.7+dfsg+really2.9.14-0.4ubuntu0.3
libxml2-dev 2.12.7+dfsg+really2.9.14-0.4ubuntu0.3
libxml2-utils 2.12.7+dfsg+really2.9.14-0.4ubuntu0.3

Ubuntu 24.04 LTS
libxml2 2.9.14+dfsg-1.3ubuntu3.5
libxml2-dev 2.9.14+dfsg-1.3ubuntu3.5
libxml2-utils 2.9.14+dfsg-1.3ubuntu3.5

Ubuntu 22.04 LTS
libxml2 2.9.13+dfsg-1ubuntu0.9
libxml2-dev 2.9.13+dfsg-1ubuntu0.9
libxml2-utils 2.9.13+dfsg-1ubuntu0.9

Ubuntu 20.04 LTS
libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm2
Available with Ubuntu Pro
libxml2-dev 2.9.10+dfsg-5ubuntu0.20.04.10+esm2
Available with Ubuntu Pro
libxml2-utils 2.9.10+dfsg-5ubuntu0.20.04.10+esm2
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm5
Available with Ubuntu Pro
libxml2-dev 2.9.4+dfsg1-6.1ubuntu1.9+esm5
Available with Ubuntu Pro
libxml2-utils 2.9.4+dfsg1-6.1ubuntu1.9+esm5
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libxml2 2.9.3+dfsg1-1ubuntu0.7+esm10
Available with Ubuntu Pro
libxml2-dev 2.9.3+dfsg1-1ubuntu0.7+esm10
Available with Ubuntu Pro
libxml2-utils 2.9.3+dfsg1-1ubuntu0.7+esm10
Available with Ubuntu Pro

Ubuntu 14.04 LTS
libxml2 2.9.1+dfsg1-3ubuntu4.13+esm9
Available with Ubuntu Pro
libxml2-dev 2.9.1+dfsg1-3ubuntu4.13+esm9
Available with Ubuntu Pro
libxml2-utils 2.9.1+dfsg1-3ubuntu4.13+esm9
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-7743-1
CVE-2025-9714

Package Information:
https://launchpad.net/ubuntu/+source/libxml2/2.12.7+dfsg+really2.9.14-0.4ubuntu0.3
https://launchpad.net/ubuntu/+source/libxml2/2.9.14+dfsg-1.3ubuntu3.5
https://launchpad.net/ubuntu/+source/libxml2/2.9.13+dfsg-1ubuntu0.9

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