GnuTLS DoS via oversized SANs in certificates
CVE-2025-14831 Published on February 9, 2026

Gnutls: gnutls: denial of service via excessive resource consumption during certificate verification
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).

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Vulnerability Analysis

CVE-2025-14831 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
LOW

Timeline

Reported to Red Hat.

Made public. 54 days later.

Weakness Type

Inefficient Algorithmic Complexity

An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.


Products Associated with CVE-2025-14831

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2025-14831 are published in these products:

Red Hat Enterprise Linux (RHEL)
 
Red Hat Openshift
 
Canonical Ubuntu Linux
 
Gnutls
 
Red Hat Insights Proxy
 
Red Hat Rhui
 

Affected Versions

Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Insights proxy 1.5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 8: Red Hat OpenShift Container Platform 4:

Exploit Probability

EPSS
0.06%
Percentile
19.20%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.