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CVE-2026-42767

Estado: AnalizadaMedia (5.9)—

Issue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL pointer dereference in a CMP client application.

Impact summary: A NULL pointer dereference causes a crash of the application and a Denial of Service.

An attacker controlling a CMP server (or acting as a man-in-the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format) CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs, causing a crash of the CMP client.

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Applications that process untrusted CMP/CRMF messages may be affected.

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).

Tecnologías afectadas (1)

Openssl — Openssl

CWE

Referencias

JSON original (NVD)

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          "options": [
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          "integrityImpact": "NONE",
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  "published": "2026-06-09T17:17:08.093",
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      "source": "openssl-security@openssl.org",
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      "value": "Issue summary: An attacker-controlled CMP (Certificate Management Protocol)\nserver could trigger a NULL pointer dereference in a CMP client application.\n\nImpact summary: A NULL pointer dereference causes a crash of the\napplication and a Denial of Service.\n\nAn attacker controlling a CMP server (or acting as a man-in-the-middle) could\ncraft a CMP response containing a CRMF (Certificate Request Message Format)\nCertRepMessage with an EncryptedValue structure where the symmAlg field\nhas an algorithm OID but no parameters field. When the OpenSSL CMP client\nprocesses this response, the NULL dereference occurs, causing a crash of\nthe CMP client.\n\nApplications that process untrusted CMP/CRMF messages may be affected.\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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      "value": "Resumen del problema: Un servidor CMP (Certificate Management Protocol) controlado por el atacante podría desencadenar una desreferencia de puntero NULL en una aplicación cliente CMP.\n\nResumen del impacto: Una desreferencia de puntero NULL causa un fallo de la aplicación y una denegación de servicio.\n\nUn atacante que controla un servidor CMP (o actuando como un man-in-the-middle) podría elaborar una respuesta CMP que contiene un CertRepMessage CRMF (Certificate Request Message Format) con una estructura EncryptedValue donde el campo symmAlg tiene un OID de algoritmo pero no un campo de parámetros. Cuando el cliente CMP de OpenSSL procesa esta respuesta, la desreferencia NULL ocurre, causando un fallo del cliente CMP.\n\nLas aplicaciones que procesan mensajes CMP/CRMF no confiables pueden verse afectadas.\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."
    }
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  "lastModified": "2026-07-23T08:10:00.137",
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