CVE-2026-42012
Full vulnerability record from the local CVENow database.
Description
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.
Severity
HIGH
CVSS score
7.1
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-05-26 22:16:41.913000
Last modified
2026-10-30 07:16:33.770000
View original CVE JSON
{
"id": "CVE-2026-42012",
"sourceIdentifier": "[email protected]",
"published": "2026-05-26T22:16:41.913",
"lastModified": "2026-10-30T07:16:33.770",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information."
},
{
"lang": "es",
"value": "Se encontró una falla en gnutls. Un atacante remoto podría explotar esta vulnerabilidad al presentar un certificado especialmente diseñado que contiene Nombres Alternativos del Sujeto (SANs) de Identificador Uniforme de Recursos (URI) o de Servicio (SRV). Esto podría causar que el proceso de validación del certificado recurra incorrectamente a la verificación de nombres de host DNS contra el Nombre Común (CN), lo que podría permitir al atacante suplantar servicios legítimos o interceptar información sensible."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"collectionURL": "https://gitlab.com/gnutls/gnutls",
"packageName": "gnutls",
"versions": [
{
"version": "0",
"status": "affected"
}
]
},
{
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