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CVE-2026-42013

Medium

Elevated severity or exploit probability.

CVSS base
8.2 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
EPSS — probability of exploitation (30 days)
0.6%
44.5th percentile
CISA KEV
Not listed
Weakness / dates
CWE-295
Published 2026-05-26 · modified 2026-09-03

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.

References

Official: NVD · CVE.org