cbcvebase.
CVE-2026-42013
published 2026-05-26

CVE-2026-42013: A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall…

high8.2CVSS 3.1
AVNACLPRNUINSUCLIHAN
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.

Affected

2 ranges
VendorProductVersion rangeFixed in
gnugnutls——
ubuntugnutls28——