CVE-2026-42013
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
8.2
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-05-26 22:16:42.050000
Last modified
2026-10-30 08:16:57.107000
View original CVE JSON
{
"id": "CVE-2026-42013",
"sourceIdentifier": "[email protected]",
"published": "2026-05-26T22:16:42.050",
"lastModified": "2026-10-30T08:16:57.107",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"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 descubrió un fallo en gnutls. Al validar certificados, un Subject Alternative Name (SAN) de tamaño excesivo podría hacer que el proceso de validación recurriera incorrectamente a la comprobación del campo Common Name (CN). Esto podría permitir a un atacante remoto eludir la validación correcta del certificado, lo que podría conducir a ataques de suplantación de identidad o man-in-the-middle."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
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{
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}
]
},
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