USN-8043-1: GnuTLS vulnerabilities

USN-8043-1: GnuTLS vulnerabilities

Publication date: 16 February 2026
Overview: Several security issues were fixed in GnuTLS.

Packages
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:

• 25.10 questing libgnutls30t64 – 3.8.9-3ubuntu2.1
• 24.04 LTS noble libgnutls30t64 – 3.8.3-1.1ubuntu3.5
• 22.04 LTS jammy libgnutls30 – 3.7.3-4ubuntu1.8