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[USN-8485-1] libyang vulnerability

Posted on 30 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8485-1
June 30, 2026

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

- Ubuntu 26.04 LTS
- Ubuntu 25.10

Summary:

libyang could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- libyang: parser toolkit for IETF YANG data modeling

Details:

It was discovered that libyang incorrectly handled certain metadata list
pointers. An attacker could use this issue to cause libyang to crash,
resulting in 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 26.04 LTS
libyang3 3.13.6-1ubuntu0.1

Ubuntu 25.10
libyang3 3.13.5-2ubuntu0.1

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

References:
https://ubuntu.com/security/notices/USN-8485-1
CVE-2026-41401

Package Information:
https://launchpad.net/ubuntu/+source/libyang/3.13.6-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libyang/3.13.5-2ubuntu0.1

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