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CVE-2026-35031

Estado: AnalizadaAlta (8.8)—

Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain in the subtitle upload endpoint (POST /Videos/{itemId}/Subtitles), where the Format field is not validated, allowing path traversal via the file extension and enabling arbitrary file write. This arbitrary file write can be chained into arbitrary file read via .strm files, database extraction, admin privilege escalation, and ultimately remote code execution as root via ld.so.preload.

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Exploitation requires an administrator account or a user that has been explicitly granted the "Upload Subtitles" permission. This issue has been fixed in version 10.11.7. If users are unable to upgrade immediately, they can grant non-administrator users Subtitle upload permissions to reduce attack surface.

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 N/AC:L/PR:L: acceso remoto con privilegios locales (admin o permiso específico). Path traversal + arbitrary write escala a RCE root via ld.so.preload. Validación ausente (CWE-20, CWE-22) en endpoint POST.

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

Threat Intelligence ProgramPrivileged Account ManagementExecution PreventionDisable or Remove Feature or ProgramApplication Isolation and SandboxingExploit Protection

Tecnologías afectadas (1)

Jellyfin — Jellyfin

CWE

Referencias

JSON original (NVD)

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      "value": "Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain in the subtitle upload endpoint (POST /Videos/{itemId}/Subtitles), where the Format field is not validated, allowing path traversal via the file extension and enabling arbitrary file write. This arbitrary file write can be chained into arbitrary file read via .strm files, database extraction, admin privilege escalation, and ultimately remote code execution as root via ld.so.preload. Exploitation requires an administrator account or a user that has been explicitly granted the \"Upload Subtitles\" permission. This issue has been fixed in version 10.11.7. If users are unable to upgrade immediately, they can grant non-administrator users Subtitle upload permissions to reduce attack surface."
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      "value": "Jellyfin es un servidor multimedia autoalojado de código abierto. Las versiones anteriores a la 10.11.7 contienen una cadena de vulnerabilidades en el punto final de carga de subtítulos (POST /Videos/{itemId}/Subtitles), donde el campo Format no se valida, lo que permite el salto de ruta a través de la extensión de archivo y habilita la escritura arbitraria de archivos. Esta escritura arbitraria de archivos se puede encadenar con la lectura arbitraria de archivos a través de archivos .strm, la extracción de la base de datos, la escalada de privilegios de administrador y, en última instancia, la ejecución remota de código como root a través de ld.so.preload. La explotación requiere una cuenta de administrador o un usuario al que se le haya concedido explícitamente el permiso 'Cargar subtítulos'. Este problema se ha solucionado en la versión 10.11.7. Si los usuarios no pueden actualizar de inmediato, pueden conceder permisos de carga de subtítulos a usuarios no administradores para reducir la superficie de ataque."
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  ],
  "lastModified": "2026-07-24T21:10:00.143",
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