CVE-2026-42012 HIGH

CVE-2026-42012: Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans

Vendor Red Hat
Product Red Hat Enterprise Linux 6
Weakness CWE-295
Published May 26, 2026
Last update June 30, 2026

CVSS base score

7.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 26, 2026 CVE published
June 30, 2026 Record updated