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CVE-2026-30853

Estado: AnalizadaAlta (8.2)—

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability in the RocketBook (.rb) input plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to write arbitrary files to any path writable by the calibre process when a user opens or converts a crafted .rb file. This is the same bug class fixed in CVE-2026-26065 for the PDB readers, but the fix was never applied to the RB reader. This vulnerability is fixed in 9.5.0.

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/convertir archivo .rb preparado. Path traversal permite escribir archivos arbitrarios (T1565.001) y potencialmente leer datos sensibles (T1005) del sistema de archivos.

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 StorageEncrypt Sensitive InformationApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Calibre-ebook — Calibre

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-30853",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-30853",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
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          ],
          "version": "2.0.3",
          "timestamp": "2026-03-13T19:42:19.321037Z"
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L",
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          "confidentialityImpact": "NONE"
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        "exploitabilityScore": 1.8
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        "cvssData": {
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              "status": "affected",
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  "published": "2026-03-13T19:54:35.077",
  "references": [
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      "url": "https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542x",
      "tags": [
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  "weaknesses": [
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      "description": [
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          "value": "CWE-22"
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  "descriptions": [
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      "lang": "en",
      "value": "calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability in the RocketBook (.rb) input plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to write arbitrary files to any path writable by the calibre process when a user opens or converts a crafted .rb file. This is the same bug class fixed in CVE-2026-26065 for the PDB readers, but the fix was never applied to the RB reader. This vulnerability is fixed in 9.5.0."
    },
    {
      "lang": "es",
      "value": "calibre es un gestor de libros electrónicos multiplataforma para ver, convertir, editar y catalogar libros electrónicos. Antes de la versión 9.5.0, una vulnerabilidad de salto de ruta en el plugin de entrada de RocketBook (.rb) (src/calibre/ebooks/rb/reader.py) permite a un atacante escribir archivos arbitrarios en cualquier ruta escribible por el proceso de calibre cuando un usuario abre o convierte un archivo .rb manipulado. Esta es la misma clase de error corregida en CVE-2026-26065 para los lectores PDB, pero la corrección nunca se aplicó al lector RB. Esta vulnerabilidad está corregida en la versión 9.5.0."
    }
  ],
  "lastModified": "2026-06-17T10:33:02.223",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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