[USN-8696-1] Bind vulnerability

[noreply+usn-bot at canonical.com]

==========================================================================
Ubuntu Security Notice USN-8696-1
August 31, 2026

bind9 vulnerability
==========================================================================

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

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Bind could be made to crash if it received specially crafted network
traffic.

Software Description:
- bind9: Internet Domain Name Server

Details:

It was discovered that Bind incorrectly handled DNSSEC validation when a
domain was covered by both NSEC and NSEC3 records with only one type having
an RRSIG. A remote attacker could possibly use this issue to cause Bind to
crash, resulting in a denial of service.

Update instructions:

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

Ubuntu 26.04 LTS
  bind9                           1:9.20.24-1ubuntu0.3

Ubuntu 24.04 LTS
  bind9                           1:9.18.39-0ubuntu0.24.04.7

Ubuntu 22.04 LTS
  bind9                           1:9.18.39-0ubuntu0.22.04.6

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

References:
  https://ubuntu.com/security/notices/USN-8696-1
  CVE-2026-13204

Package Information:
  https://launchpad.net/ubuntu/+source/bind9/1:9.20.24-1ubuntu0.3
  https://launchpad.net/ubuntu/+source/bind9/1:9.18.39-0ubuntu0.24.04.7
  https://launchpad.net/ubuntu/+source/bind9/1:9.18.39-0ubuntu0.22.04.6
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