USN-8449-1: ldns vulnerability

Publication date

18 June 2026

Overview

ldns could be made to accept spoofed DNS responses.


Packages

  • ldns - ldns library for DNS programming

Details

Pablo Ruiz discovered that ldns did not properly validate DNS
responses when used as a stub resolver over UDP. A remote
attacker could possibly use this issue to inject arbitrary DNS
responses.

Pablo Ruiz discovered that ldns did not properly validate DNS
responses when used as a stub resolver over UDP. A remote
attacker could possibly use this issue to inject arbitrary DNS
responses.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
26.04 LTS resolute ldnsutils –  1.8.4-2ubuntu0.26.04.1~esm1  
libldns3t64 –  1.8.4-2ubuntu0.26.04.1~esm1  
24.04 LTS noble ldnsutils –  1.8.3-2ubuntu0.1~esm1  
libldns3t64 –  1.8.3-2ubuntu0.1~esm1  
22.04 LTS jammy ldnsutils –  1.7.1-2ubuntu4+esm2  
libldns3 –  1.7.1-2ubuntu4+esm2  
20.04 LTS focal ldnsutils –  1.7.0-4.1ubuntu1+esm2  
libldns2 –  1.7.0-4.1ubuntu1+esm2  
18.04 LTS bionic ldnsutils –  1.7.0-3ubuntu4.1+esm1  
libldns2 –  1.7.0-3ubuntu4.1+esm1  
16.04 LTS xenial ldnsutils –  1.6.17-8ubuntu0.1+esm2  
libldns1 –  1.6.17-8ubuntu0.1+esm2  

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Have additional questions?

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