[USN-7632-1] YAML-LibYAML vulnerability

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Ubuntu Security Notice USN-7632-1
July 09, 2025

libyaml-libyaml-perl vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

YAML-LibYAML could be made to overwrite files.

Software Description:
- libyaml-libyaml-perl: Perl interface to libyaml, a YAML implementation

Details:

It was discovered that YAML-LibYAML incorrectly handled certain file
names. An attacker could possibly use this issue to overwrite arbitrary
files.

Update instructions:

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

Ubuntu 24.04 LTS
libyaml-libyaml-perl 0.89+ds-1ubuntu0.24.04.1

Ubuntu 22.04 LTS
libyaml-libyaml-perl 0.83+ds-1ubuntu0.22.04.1

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

References:
https://ubuntu.com/security/notices/USN-7632-1
CVE-2025-40908

Package Information:
https://launchpad.net/ubuntu/+source/libyaml-libyaml-perl/0.89+ds-1ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/libyaml-libyaml-perl/0.83+ds-1ubuntu0.22.04.1