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CVE-2026-42013

| EUVD-2026-32011 HIGH
Improper Validation of Specified Quantity in Input (CWE-1284)
2026-05-26 redhat
Authentication Bypass
8.2
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

Lifecycle Timeline

2
Analysis Generated
May 26, 2026 - 22:14 vuln.today
CVE Published
May 26, 2026 - 21:29 nvd
HIGH 8.2

DescriptionNVD

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.

AnalysisAI

Certificate validation bypass in GnuTLS (as shipped in Red Hat Enterprise Linux 6 through 10, OpenShift Container Platform 4, and Red Hat Hardened Images) lets a remote attacker defeat hostname verification: when a certificate carries an oversized Subject Alternative Name, the library incorrectly abandons SAN matching and falls back to the legacy Common Name field, accepting certificates it should reject. An attacker positioned to intercept traffic can present such a certificate to impersonate a trusted server and conduct spoofing or man-in-the-middle attacks against TLS clients that rely on GnuTLS. …

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CVE-2026-42013 vulnerability details – vuln.today
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