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ModelScan Bypass PoC — builtins.type

Security research for responsible disclosure via Huntr MFV program.

Vulnerability

builtins.type is not in modelscan's unsafe_globals blocklist. When a pickle file containing this global is scanned by modelscan, it reports "No issues found." However, loading the file with pickle.loads() / torch.load() triggers arbitrary class construction — enables metaclass chains and typing.get_type_hints eval() RCE.

Impact

Severity: HIGH
Effect: arbitrary class construction — enables metaclass chains and typing.get_type_hints eval() RCE

Bypass Class

modelscan blocks builtins.eval, builtins.exec, builtins.getattr, etc. but does NOT block builtins.type. type(name, bases, dict) constructs arbitrary classes, which can then be fed to typing.get_type_hints for eval()-based RCE.

Reproduction

pip install modelscan
modelscan scan -p bypass_poc.pkl
# Output: "No issues found!"

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