USN-7844-1: YAML::Syck vulnerability

Publication date

28 October 2025

Overview

The system could be made to expose sensitive information.


Packages

  • libyaml-syck-perl - Perl module providing a fast, lightweight YAML loader and dumper

Details

It was discovered that YAML::Syck did not properly handle parsing YAML
files. An attacker could possibly use this issue to expose sensitive
information.

It was discovered that YAML::Syck did not properly handle parsing YAML
files. An attacker could possibly use this issue to expose sensitive
information.

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
25.10 questing libyaml-syck-perl –  1.34-3ubuntu0.1
25.04 plucky libyaml-syck-perl –  1.34-2ubuntu0.25.04.1
24.04 LTS noble libyaml-syck-perl –  1.34-2ubuntu0.24.04.1~esm1  
22.04 LTS jammy libyaml-syck-perl –  1.34-1ubuntu0.1~esm1  
20.04 LTS focal libyaml-syck-perl –  1.31-1ubuntu0.1~esm1  
18.04 LTS bionic libyaml-syck-perl –  1.29-1ubuntu0.18.04.1~esm1  
16.04 LTS xenial libyaml-syck-perl –  1.29-1ubuntu0.16.04.1~esm1  

Reduce your security exposure

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