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CVE-2026-42764

Estado: AnalizadaAlta (7.5)—

Issue summary: Receiving a QUIC initial packet with an invalid token may trigger a NULL pointer dereference in the OpenSSL QUIC server with address validation disabled.

Impact summary: NULL pointer dereference typically causes abnormal termination of the affected QUIC server process and a Denial of Service.

If the address validation is disabled in the OpenSSL QUIC server implementation, an attacker can crash the server by sending an initial packet with an invalid or expired token.

By default, the client address validation is enabled in the OpenSSL QUIC server implementation, which makes the default configuration not vulnerable to this issue.

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However if the SSL_LISTENER_FLAG_NO_VALIDATE is used with the SSL_new_listener() call, the address validation is disabled making the vulnerable code reachable.

The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vector CVSS AV:N/AC:L/PR:N permite acceso remoto sin privilegios (T1190). NULL pointer dereference en servidor QUIC causa terminación anormal y DoS (T1499.004).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Openssl — Openssl

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-42764",
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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      "value": "Issue summary: Receiving a QUIC initial packet with an invalid token may\ntrigger a NULL pointer dereference in the OpenSSL QUIC server with\naddress validation disabled.\n\nImpact summary: NULL pointer dereference typically causes abnormal termination\nof the affected QUIC server process and a Denial of Service.\n\nIf the address validation is disabled in the OpenSSL QUIC server\nimplementation, an attacker can crash the server by sending an initial\npacket with an invalid or expired token.\n\nBy default, the client address validation is enabled in the OpenSSL QUIC server\nimplementation, which makes the default configuration not vulnerable\nto this issue. However if the SSL_LISTENER_FLAG_NO_VALIDATE is used with\nthe SSL_new_listener() call, the address validation is disabled making the\nvulnerable code reachable.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\nissue, as the affected code is outside the OpenSSL FIPS module boundary."
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    {
      "lang": "es",
      "value": "Resumen del problema: Recibir un paquete inicial QUIC con un token inválido puede desencadenar una desreferencia de puntero NULL en el servidor QUIC de OpenSSL con la validación de direcciones deshabilitada.\n\nResumen del impacto: La desreferencia de puntero NULL típicamente causa la terminación anormal del proceso del servidor QUIC afectado y una denegación de servicio.\n\nSi la validación de direcciones está deshabilitada en la implementación del servidor QUIC de OpenSSL, un atacante puede bloquear el servidor enviando un paquete inicial con un token inválido o caducado.\n\nPor defecto, la validación de direcciones del cliente está habilitada en la implementación del servidor QUIC de OpenSSL, lo que hace que la configuración predeterminada no sea vulnerable a este problema. Sin embargo, si se utiliza SSL_LISTENER_FLAG_NO_VALIDATE con la llamada a SSL_new_listener(), la validación de direcciones se deshabilita, haciendo que el código vulnerable sea accesible.\n\nLos módulos FIPS en 4.0, 3.6, 3.5, 3.4 y 3.0 no se ven afectados por este problema, ya que el código afectado está fuera del límite del módulo FIPS de OpenSSL."
    }
  ],
  "lastModified": "2026-07-23T08:10:00.137",
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