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Vulnerabilities CVE-2026-42012

CVE-2026-42012

High
Open
TLP:CLEAR

Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans

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Description

A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.

Details

CVSS Score
7.1
EPSS Score
0.35%

28.5th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Confidence
90%
Published
May 26, 2026
Last Modified
Jul 15, 2026
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