PYSEC-2026-484 PraisonAI: Python Sandbox Escape via str Subclass startswith() Override in execute_code

Summary executecode in praisonai-agents runs attacker-controlled Python inside a three-layer sandbox that can be fully bypassed by passing a str subclass with an overridden startswith method to the safegetattr wrapper, achieving arbitrary OS command execution on the host. Details pythontools.py:2...