CVE-2026-42013

Name: CVE-2026-42013
Creator: NVD / NIST
Published: 2026-05-26T22:16:42.05+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.39%

Last modified Jun 26, 2026

This CVE is reserved or awaiting analysis. Details will appear once published by NVD.

Description

A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.

Metrics

CVSS 3.1

8.2/10

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

EPSS Probability

0.39%

30.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

References

https://access.redhat.com/errata/RHSA-2026:20611
https://access.redhat.com/errata/RHSA-2026:20612
https://access.redhat.com/errata/RHSA-2026:20613
https://access.redhat.com/errata/RHSA-2026:26319
https://access.redhat.com/errata/RHSA-2026:26409
https://access.redhat.com/errata/RHSA-2026:29197
https://access.redhat.com/errata/RHSA-2026:30004
https://access.redhat.com/security/cve/CVE-2026-42013
https://bugzilla.redhat.com/show_bug.cgi?id=2467448
https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8

Timeline

Published: May 26, 2026
Last Modified: Jun 26, 2026
Status: Awaiting Analysis

Are you affected by CVE-2026-42013?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST