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[USN-8043-1] GnuTLS vulnerabilities

Posted on 16 February 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8043-1
February 16, 2026

gnutls28 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in GnuTLS.

Software Description:
- gnutls28: GNU TLS library

Details:

Tim Scheckenbach discovered that GnuTLS incorrectly handled malicious
certificates containing a large number of name constraints and subject
alternative names. A remote attacker could possibly use this issue to
cause GnuTLS to consume resources, resulting in a denial of service.
(CVE-2025-14831)

Luigino Camastra discovered that GnuTLS incorrectly handled certain PKCS11
token labels. A remote attacker could use this issue to cause GnuTLS to
crash, resulting in a denial of service, or possibly execute arbitrary
code. The default compiler options for affected releases should reduce the
vulnerability to a denial of service. (CVE-2025-9820)

Update instructions:

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

Ubuntu 25.10
libgnutls30t64 3.8.9-3ubuntu2.1

Ubuntu 24.04 LTS
libgnutls30t64 3.8.3-1.1ubuntu3.5

Ubuntu 22.04 LTS
libgnutls30 3.7.3-4ubuntu1.8

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

References:
https://ubuntu.com/security/notices/USN-8043-1
CVE-2025-14831, CVE-2025-9820

Package Information:
https://launchpad.net/ubuntu/+source/gnutls28/3.8.9-3ubuntu2.1
https://launchpad.net/ubuntu/+source/gnutls28/3.8.3-1.1ubuntu3.5
https://launchpad.net/ubuntu/+source/gnutls28/3.7.3-4ubuntu1.8

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