PYSEC-2026-3533 PraisonAI: execute_code sandbox bypass: str.format C-level attribute access reads every blocklisted dunder

Summary The executecode tool's subprocess sandbox advertises a three-layer defense AST validation, text-pattern blocklist, restricted builtins. In sandbox mode the default only two layers are active — the text-pattern blocklist is skipped — and both remaining layers are bypassed by combining two...