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CVE-2026-25636

Estado: AnalizadaAlta (7.8)—

calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. This vulnerability is fixed in 9.2.0.

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.

Requiere interacción del usuario (UI:R) al abrir EPUB malicioso en Calibre. El impacto principal es corrupción de archivos existentes (T1565); secundariamente, lectura de datos (T1005) al procesar el archivo.

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

Restrict File and Directory PermissionsRemote Data StorageNetwork SegmentationEncrypt Sensitive InformationApplication Isolation and SandboxingExploit Protection

Tecnologías afectadas (1)

Calibre-ebook — Calibre

CWE

Referencias

JSON original (NVD)

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    },
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      "value": "calibre es un gestor de libros electrónicos. En 9.1.0 y versiones anteriores, una vulnerabilidad de salto de ruta en la conversión de EPUB de Calibre permite que un archivo EPUB malicioso corrompa archivos existentes arbitrarios escribibles por el proceso de Calibre. Durante la conversión, Calibre resuelve la URI de CipherReference de META-INF/encryption.xml a una ruta de sistema de archivos absoluta y lo abre en modo de lectura-escritura, incluso cuando apunta fuera del directorio de extracción de la conversión. Esta vulnerabilidad está corregida en 9.2.0."
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  "lastModified": "2026-06-17T10:24:59.430",
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