[USN-7855-1] Unbound vulnerability

[Marc Deslauriers]

==========================================================================
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

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