[USN-7855-1] Unbound vulnerability

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==========================================================================
Ubuntu Security Notice USN-7855-1
November 04, 2025

unbound vulnerability
==========================================================================

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

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Unbound could be made to hijack domains if it received specially crafted
network traffic.

Software Description:
- unbound: validating, recursive, caching DNS resolver

Details:

Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that Unbound
incorrectly handled certain promiscuous NS RRSets. A remote attacker could
possibly use this issue to perform a domain hijack attack.

Update instructions:

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

Ubuntu 25.10
libunbound8 1.22.0-2ubuntu2.1
unbound 1.22.0-2ubuntu2.1

Ubuntu 25.04
libunbound8 1.22.0-1ubuntu1.2
unbound 1.22.0-1ubuntu1.2

Ubuntu 24.04 LTS
libunbound8 1.19.2-1ubuntu3.6
unbound 1.19.2-1ubuntu3.6

Ubuntu 22.04 LTS
libunbound8 1.13.1-1ubuntu5.13
unbound 1.13.1-1ubuntu5.13

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

References:
https://ubuntu.com/security/notices/USN-7855-1
CVE-2025-11411

Package Information:
https://launchpad.net/ubuntu/+source/unbound/1.22.0-2ubuntu2.1
https://launchpad.net/ubuntu/+source/unbound/1.22.0-1ubuntu1.2
https://launchpad.net/ubuntu/+source/unbound/1.19.2-1ubuntu3.6
https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.13