CVE-2026-42011 HIGH

CVE-2026-42011: Gnutls: gnutls: security bypass due to incorrect name constraint handling

Vendor Red Hat
Product Red Hat Enterprise Linux 6
Weakness CWE-295
Published May 7, 2026
Last update June 30, 2026

CVSS base score

7.4/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.

Key dates

02Disclosure timeline

May 7, 2026 CVE published
June 30, 2026 Record updated