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Este fallo de escape del sandbox est\u00e1 presente en las versiones 0.11.4 y anteriores a las versiones reparadas 1.8.5 y 1.10.0. El servicio D-Bus del portal Flatpak (\"flatpak-portal\", tambi\u00e9n conocido por su nombre de servicio D-Bus \"org.freedesktop.portal.Flatpak\") permite que las aplicaciones en un sandbox de Flatpak inicien sus propios subprocesos en una nueva instancia del sandbox, ya sea con la misma configuraci\u00f3n de seguridad que la persona que llama o con una configuraci\u00f3n de seguridad m\u00e1s restrictiva. Por ejemplo, esto se usa en navegadores web empaquetados con Flatpak, como Chromium, para iniciar subprocesos que procesar\u00e1n contenido web no confiable. y dar a esos subprocesos un sandbox m\u00e1s restrictivo que el propio navegador. En versiones vulnerables, el servicio del portal Flatpak pasa las variables de entorno especificadas por la persona que llama hacia procesos que no est\u00e1n en el sandbox en el sistema host y, en particular, al comando \"flatpak run\" que se usa para iniciar la nueva instancia del sandbox. Una aplicaci\u00f3n Flatpak maliciosa o comprometida podr\u00eda establecer variables de entorno en las que conf\u00ede el comando \"flatpak run\" y usarlas para ejecutar c\u00f3digo arbitrario que no se encuentra en un sandbox. Como soluci\u00f3n alternativa, esta vulnerabilidad puede ser mitigada evitando que se inicie el servicio \"flatpak-portal\", pero esa mitigaci\u00f3n impedir\u00e1 que muchas aplicaciones de Flatpak funcionen correctamente. 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