USN-7743-1: libxml2 vulnerability

Publication date

10 September 2025

Overview

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


Packages

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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
25.04 plucky 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
24.04 noble 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
22.04 jammy libxml2 –  2.9.13+dfsg-1ubuntu0.9
libxml2-dev –  2.9.13+dfsg-1ubuntu0.9
libxml2-utils –  2.9.13+dfsg-1ubuntu0.9
20.04 focal libxml2 –  2.9.10+dfsg-5ubuntu0.20.04.10+esm2  
libxml2-dev –  2.9.10+dfsg-5ubuntu0.20.04.10+esm2  
libxml2-utils –  2.9.10+dfsg-5ubuntu0.20.04.10+esm2  
18.04 bionic libxml2 –  2.9.4+dfsg1-6.1ubuntu1.9+esm5  
libxml2-dev –  2.9.4+dfsg1-6.1ubuntu1.9+esm5  
libxml2-utils –  2.9.4+dfsg1-6.1ubuntu1.9+esm5  
16.04 xenial libxml2 –  2.9.3+dfsg1-1ubuntu0.7+esm10  
libxml2-dev –  2.9.3+dfsg1-1ubuntu0.7+esm10  
libxml2-utils –  2.9.3+dfsg1-1ubuntu0.7+esm10  
14.04 trusty libxml2 –  2.9.1+dfsg1-3ubuntu4.13+esm9  
libxml2-dev –  2.9.1+dfsg1-3ubuntu4.13+esm9  
libxml2-utils –  2.9.1+dfsg1-3ubuntu4.13+esm9  

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