CVE-2025-14831

Publication date 9 February 2026

Last updated 16 February 2026

Ubuntu priority

Cvss 3 Severity Score

Description

A flaw was found in GnuTLS. This vulnerability allows a denial of service (DoS) by excessive CPU (Central Processing Unit) and memory consumption via specially crafted malicious certificates containing a large number of name constraints and subject alternative names (SANs).

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gnutls28	25.10 questing	Fixed 3.8.9-3ubuntu2.1
	24.04 LTS noble	Fixed 3.8.3-1.1ubuntu3.5
	22.04 LTS jammy	Fixed 3.7.3-4ubuntu1.8
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
gnutls28	Upstream: 0b2377d Upstream: 85d6348 Upstream: c284754 Upstream: 6db7da7 Upstream: 094accd Upstream: bc62fbb Upstream: 80db5e9 Upstream: d0ac999 Upstream: d6054f0

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

USN-8043-1
GnuTLS vulnerabilities
16 February 2026