PT-2026-37378 · Gnutls+4 · Gnutls+4

Bzimport · CVE-2026-42011 · Published 2026-04-29 · Updated 2026-07-22

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

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

Name of the Vulnerable Software and Affected Versions gnutls versions prior to 3.8.13-1.1

Description A flaw exists where permitted name constraints are incorrectly ignored when previous Certificate Authorities (CAs) only have excluded name constraints. A remote attacker can exploit this to bypass critical name constraint checks during certificate validation, which may lead to the acceptance of invalid certificates and enable spoofing or man-in-the-middle attacks.

Recommendations Update to version 3.8.13-1.1.

Fix

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

ALSA-2026:20611

ALSA-2026:20612

ALSA-2026:20613

BDU:2026-09661

CVE-2026-42011

ECHO-00BB-2656-B63A

OPENSUSE-SU-2026:10691-1

RHSA-2026:13274

RHSA-2026:20611

RHSA-2026:26409

SUSE-SU-2026:2822-1

SUSE-SU-2026:2923-1

SUSE-SU-2026:2924-1

USN-8284-1

USN-8539-1

Affected Products

Linuxmint

Red Os

Rocky Linux

Ubuntu

Gnutls

References · 125

• https://osv.dev/vulnerability/SUSE-SU-2026:2923-1 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:29197 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-20613.html · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-20612.html · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-42011 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42011 · Security Note
• https://access.redhat.com/errata/RHSA-2026:13274 · Vendor Advisory
• https://errata.almalinux.org/8/ALSA-2026-20611.html · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:30850 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42009 · Vendor Advisory
• https://errata.almalinux.org/9/ALSA-2026-20612.html · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2026-42011 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:20613 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-42011 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42013 · Vendor Advisory