CVE-2026-27494: n8n has Arbitrary File Read via Python Code Node Sandbox Escape

An authenticated user with permission to create or modify workflows could use the Python Code node to escape the sandbox. The sandbox did not sufficiently restrict access to certain built-in Python objects, allowing an attacker to exfiltrate file contents or achieve RCE.

On instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner.

• Task Runners must be enabled using N8N_RUNNERS_ENABLED=true.