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CVE-2026-34580

Estado: ModificadaCrítica (9.3)—

Botan is a C++ cryptography library. In 3.11.0, the function Certificate_Store::certificate_known had a misleading name; it would return true if any certificate in the store had a DN (and subject key identifier, if set) matching that of the argument. It did not check that the cert it found and the cert it was passed were actually the same certificate. In 3.11.0 an extension of path validation logic was made which assumed that certificate_known only returned true if the certificates were in fact identical.

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The impact is that if an end entity certificate is presented, and its DN (and subject key identifier, if set) match that of any trusted root, the end entity certificate is accepted immediately as if it itself were a trusted root. , This vulnerability is fixed in 3.11.1.

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.

Acceso remoto sin autenticación (AV:N/PR:N/UI:N) a biblioteca criptográfica que valida falsamente certificados, permitiendo suplantación (MITM) y asunción de identidad de raíces confiables.

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

User TrainingPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Developer Guidance

Tecnologías afectadas (1)

Botan Project — Botan

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-34580",
  "cveTags": [],
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      "lang": "en",
      "value": "Botan is a C++ cryptography library. In 3.11.0, the function Certificate_Store::certificate_known had a misleading name; it would return true if any certificate in the store had a DN (and subject key identifier, if set) matching that of the argument. It did not check that the cert it found and the cert it was passed were actually the same certificate. In 3.11.0 an extension of path validation logic was made which assumed that certificate_known only returned true if the certificates were in fact identical. The impact is that if an end entity certificate is presented, and its DN (and subject key identifier, if set) match that of any trusted root, the end entity certificate is accepted immediately as if it itself were a trusted root. , This vulnerability is fixed in 3.11.1."
    },
    {
      "lang": "es",
      "value": "Botan es una biblioteca de criptografía C++. En 3.11.0, la función Certificate_Store::certificate_known tenía un nombre engañoso; devolvería verdadero si cualquier certificado en el almacén tuviera un DN (y un identificador de clave de sujeto, si está configurado) que coincidiera con el del argumento. No verificaba que el certificado que encontró y el certificado que se le pasó fueran realmente el mismo certificado. En 3.11.0 se hizo una extensión de la lógica de validación de ruta que asumía que certificate_known solo devolvía verdadero si los certificados eran de hecho idénticos. El impacto es que si se presenta un certificado de entidad final, y su DN (y el identificador de clave de sujeto, si está configurado) coincide con el de cualquier raíz de confianza, el certificado de entidad final es aceptado inmediatamente como si él mismo fuera una raíz de confianza. , Esta vulnerabilidad está corregida en 3.11.1."
    }
  ],
  "lastModified": "2026-07-24T22:10:00.140",
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