Pickle

A Pyodide client serializes requests with pickle obfuscated by a hardcoded XOR key, letting the server pickle.loads attacker data for unauthenticated root RCE, then hooking the live handler to capture the adminbot’s plaintext login password.

The hardened secretpickle runs pickle.loads in a write-only seccomp sandbox, but the adminbot action visits an attacker URL with no scheme check and returns a screenshot, so file:///flag.txt renders the flag into the image.