CVE-2026-42011

Description

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.

Affected packages (2)

• Alpine/gnutlsfrom 0, < 3.8.13-r0
• Debian/gnutls28from 0, < 3.7.1-5+deb11u10

CVSS scores

References (2)

• ADVISORYhttps://security.alpinelinux.org/vuln/CVE-2026-42011
• ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-42011