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Ubuntu 26.04 LTS ldns Important Spoofed DNS Response Risk USN-8449-1

ubuntu
Calendar Grey June 18, 2026
Dist Ubuntu Esm H88
A crucial update on ldns vulnerabilities affecting multiple Ubuntu LTS versions. Important patch instructions included.
ldns could be made to accept spoofed DNS responses.

Summary

ldns could be made to accept spoofed DNS responses.

Software Description:

- 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.

Topics%20covered

Topics Covered

security advisory remote access Ubuntu important ldns spoofed DNS

Update Instructions

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

Ubuntu 26.04 LTS
  ldnsutils                       1.8.4-2ubuntu0.26.04.1~esm1
                                  Available with Ubuntu Pro
  libldns3t64                     1.8.4-2ubuntu0.26.04.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 24.04 LTS
  ldnsutils                       1.8.3-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libldns3t64                     1.8.3-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  ldnsutils                       1.7.1-2ubuntu4+esm2
                                  Available with Ubuntu Pro
  libldns3                        1.7.1-2ubuntu4+esm2
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  ldnsutils                       1.7.0-4.1ubuntu1+esm2
                                  Available with Ubuntu Pro
  libldns2                        1.7.0-4.1ubuntu1+esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  ldnsutils                       1.7.0-3ubuntu4.1+esm1
                                  Available with Ubuntu Pro
  libldns2                        1.7.0-3ubuntu4.1+esm1
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  ldnsutils                       1.6.17-8ubuntu0.1+esm2
                                  Available with Ubuntu Pro
  libldns1                        1.6.17-8ubuntu0.1+esm2
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8449-1

CVE-2026-10846

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8449-1

Topics%20covered

Topics Covered

security advisory remote access Ubuntu important ldns spoofed DNS

Package Information

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