CVE-2026-0863

Using string formatting and exception handling, an attacker may bypass n8n's python-task-executor sandbox restrictions and run arbitrary unrestricted Python code in the underlying operating system. The vulnerability can be exploited via the Code block by an authenticated user with basic permissions and can lead to a full n8n instance takeover on instances operating under "Internal" execution mode. If the instance is operating under the "External" execution mode (ex. n8n's official Docker image) - arbitrary code execution occurs inside a Sidecar container and not the main node, which significantly reduces the vulnerability impact.

Using string formatting and exception handling, an attacker may bypass n8n's python-task-executor sandbox restrictions and run arbitrary unrestricted Python code in the underlying operating system. The vulnerability can be exploited via the Code block by an authenticated user with basic permissions and can lead to a full n8n instance takeover on instances operating under "Internal" execution mode. If the instance is operating under the "External" execution mode (ex. n8n's official Docker image) - arbitrary code execution occurs inside a Sidecar container and not the main node, which significantly reduces the vulnerability impact.

Usando formato de cadenas y manejo de excepciones, un atacante puede eludir las restricciones del sandbox python-task-executor de n8n y ejecutar código Python arbitrario sin restricciones en el sistema operativo subyacente. La vulnerabilidad puede ser explotada a través del bloque de Código por un usuario autenticado con permisos básicos y puede llevar a una toma de control completa de la instancia de n8n en instancias que operan bajo el modo de ejecución 'Internal'. Si la instancia está operando bajo el modo de ejecución 'External' (ej. la imagen oficial de Docker de n8n) - la ejecución de código arbitrario ocurre dentro de un contenedor Sidecar y no en el nodo principal, lo que reduce significativamente el impacto de la vulnerabilidad.