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[USN-8682-1] Bind vulnerabilities

Posted on 27 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8682-1
August 26, 2026

bind9 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Bind.

Software Description:
- bind9: Internet Domain Name Server

Details:

Vitaly Simonovich discovered that Bind could exhaust memory during
GSS-API TKEY negotiation. A remote attacker could possibly use this
issue to cause Bind to use excessive resources, leading to a denial of
service. (CVE-2026-3039)

Shuhan Zhang discovered that Bind incorrectly handled self-pointed glue
records. A remote attacker could possibly use this issue to use Bind in
denial of service amplification attacks against other systems.
This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
(CVE-2026-3592)

It was discovered that Bind incorrectly handled DNS messages whose
class was not IN. A remote attacker could possibly use this issue to
cause Bind to crash, resulting in a denial of service. This issue only
affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2026-5946)

Update instructions:

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

Ubuntu 20.04 LTS
bind9 1:9.18.30-0ubuntu0.20.04.2+esm2
Available with Ubuntu Pro

Ubuntu 18.04 LTS
bind9 1:9.11.3+dfsg-1ubuntu1.19+esm5
Available with Ubuntu Pro

Ubuntu 16.04 LTS
bind9 1:9.10.3.dfsg.P4-8ubuntu1.19+esm10
Available with Ubuntu Pro

Ubuntu 14.04 LTS
bind9 1:9.9.5.dfsg-3ubuntu0.19+esm14
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8682-1
CVE-2026-3039, CVE-2026-3592, CVE-2026-5946

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