DeepCode contains a path traversal vulnerability in the SPA catch-all route that allows unauthenticated attackers to read arbitrary files. The vulnerability exists in new_ui/backend/main.py and can be exploited by supplying percent-encoded path segments to the GET /{full_path:path} endpoint. Attackers can bypass Starlette's path normalization by encoding slashes as %2F and dots as %2E%2E. This causes the joined path to traverse outside FRONTEND_DIST directory. The vulnerability exposes sensitive files such as SSH private keys, TLS certificates, and application secrets. The exploit requires only a single HTTP request to access unauthorized files.