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Ubuntu 25.10: Unbound Important Domain Hijack Vulnerability USN-7855-1

ubuntu
Calendar Grey November 4, 2025
Dist Ubuntu Esm H88
Unbound on Ubuntu could be exploited to hijack domains via crafted network traffic. Update recommended.
Unbound could be made to hijack domains if it received specially crafted network traffic.

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.

Topics%20covered

Topics Covered

security advisory Ubuntu important network traffic domain hijack unbound

Update Instructions

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

Ubuntu 25.10
   libunbound8                     1.22.0-2ubuntu2.1
   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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7855-1

Topics%20covered

Topics Covered

security advisory Ubuntu important network traffic domain hijack unbound

Package Information

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