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 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.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:13274
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/errata/RHSA-2026:30849
https://access.redhat.com/errata/RHSA-2026:30850
https://access.redhat.com/errata/RHSA-2026:32962
https://access.redhat.com/errata/RHSA-2026:33125
https://access.redhat.com/errata/RHSA-2026:40762
https://access.redhat.com/errata/RHSA-2026:41921
https://access.redhat.com/errata/RHSA-2026:43575
https://access.redhat.com/errata/RHSA-2026:56853
https://access.redhat.com/errata/RHSA-2026:57483
https://access.redhat.com/errata/RHSA-2026:58981
https://access.redhat.com/errata/RHSA-2026:59831
https://access.redhat.com/errata/RHSA-2026:60019
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-05-26 22:16

Updated : 2026-09-03 15:17

NVD link : CVE-2026-42013

Mitre link : CVE-2026-42013

CVE.ORG link : CVE-2026-42013

JSON object : View

Products Affected

No product.

CWE

CWE-295

Improper Certificate Validation

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"https://access.redhat.com/errata/RHSA-2026:20612", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:20613", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:26319", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:26409", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:29197", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:30004", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:30849", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:30850", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:32962", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:33125", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:40762", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:41921", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:43575", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:56853", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:57483", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:58981", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:59831", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:60019", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-42013", "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467448", "source": "secalert@redhat.com"}, {"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8", "source": "secalert@redhat.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-295"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se descubri\u00f3 un fallo en gnutls. Al validar certificados, un Subject Alternative Name (SAN) de tama\u00f1o excesivo podr\u00eda hacer que el proceso de validaci\u00f3n recurriera incorrectamente a la comprobaci\u00f3n del campo Common Name (CN). Esto podr\u00eda permitir a un atacante remoto eludir la validaci\u00f3n correcta del certificado, lo que podr\u00eda conducir a ataques de suplantaci\u00f3n de identidad o man-in-the-middle."}], "lastModified": "2026-09-03T15:17:27.730", "sourceIdentifier": "secalert@redhat.com"}