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Ubuntu 25.10: Unbound Critical Regression Fix CVE-2025-11411 USN-7855-2

ubuntu
Calendar Grey December 2, 2025
Dist Ubuntu Esm H88
Unbound in Ubuntu faces a critical regression issue affecting multiple releases, requiring immediate updates.
USN-7855-1 introduced a regression in Unbound

Summary

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: USN-7855-1 introduced a regression in Unbound Software Description: - unbound: validating, recursive, caching DNS resolver Details: USN-7855-1 fixed vulnerabilities in Unbound. It was discovered that the fix for CVE-2025-11411 was incomplete. This update fixes the problem. Original advisory 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.

Topics%20covered

Topics Covered

security advisory critical Ubuntu domain hijacking regression unbound

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 libunbound8 1.22.0-2ubuntu2.2 unbound 1.22.0-2ubuntu2.2 Ubuntu 25.04 libunbound8 1.22.0-1ubuntu1.3 unbound 1.22.0-1ubuntu1.3 Ubuntu 24.04 LTS libunbound8 1.19.2-1ubuntu3.7 unbound 1.19.2-1ubuntu3.7 Ubuntu 22.04 LTS libunbound8 1.13.1-1ubuntu5.14 unbound 1.13.1-1ubuntu5.14 In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7855-2

https://ubuntu.com/security/notices/USN-7855-1

CVE-2025-11411, https://bugs.launchpad.net/ubuntu/+source/unbound/+bug/2133715

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7855-2

Topics%20covered

Topics Covered

security advisory critical Ubuntu domain hijacking regression unbound

Package Information

https://launchpad.net/ubuntu/+source/unbound/1.22.0-2ubuntu2.2 https://launchpad.net/ubuntu/+source/unbound/1.22.0-1ubuntu1.3 https://launchpad.net/ubuntu/+source/unbound/1.19.2-1ubuntu3.7 https://launchpad.net/ubuntu/+source/unbound/1.13.1-1ubuntu5.14

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