====================================================================== Crawl4AI RCE Fix Bypass Analysis CVE-2026-26216 / GHSA-5882-5rx9-xgxp ====================================================================== Testing bypass attempts against the v0.8.0 fix... Fix: Removed __import__ from allowed_builtins Hooks disabled by default (CRAWL4AI_HOOKS_ENABLED=false) ============================================================ VARIANT 1: Using getattr to access __import__ ============================================================ [RESULT] Bypass 1 failed with exception: __import__ not found ============================================================ VARIANT 2: Using __build_class__ to create malicious class ============================================================ [RESULT] Bypass 2 failed with exception: __import__ not found ============================================================ VARIANT 3: Using type() constructor tricks ============================================================ [RESULT] Bypass 3 failed with exception: __import__ not found ============================================================ VARIANT 4: Using getattr on __builtins__ ============================================================ [RESULT] Bypass 4 failed with exception: __import__ not found ============================================================ VARIANT 5: Using setattr injection ============================================================ [RESULT] Bypass 5 failed with exception: __import__ not found ============================================================ VARIANT 6: Using object.__subclasses__() ============================================================ [RESULT] Bypass 6 failed with exception: __import__ not found ============================================================ VARIANT 7: Using types.CodeType ============================================================ [RESULT] Bypass 7 failed with exception: __import__ not found ============================================================ VARIANT 8: Using compile() function ============================================================ [RESULT] Bypass 8 failed with exception: __import__ not found ====================================================================== SUMMARY ====================================================================== Total bypass attempts: 8 Successful bypasses: 0 Failed bypasses: 8 [+] All bypass attempts failed [+] The fix appears to be effective against tested bypass methods However, note that the fix requires: 1. __import__ removed from allowed_builtins (VERIFIED) 2. CRAWL4AI_HOOKS_ENABLED=false by default (CONFIGURATION) The second point is a configuration fix, not a code fix. If users enable hooks (CRAWL4AI_HOOKS_ENABLED=true), they are still at risk if other sandbox escape techniques are found.