Ubuntu alert USN-8449-1 (ldns)

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[USN-8449-1] ldns vulnerability
Date:
             
 
Thu, 18 Jun 2026 14:38:22 +0000
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<E1waDss-0006Pt-Pg@lists.ubuntu.com>
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noreply+usn-bot@canonical.com
==========================================================================
Ubuntu Security Notice USN-8449-1
June 18, 2026

ldns vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

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.

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


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