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ModelScan Bypass PoC — atexit.register

Security research for responsible disclosure via Huntr MFV program.

Vulnerability

atexit.register 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 registers arbitrary callable for deferred execution at interpreter shutdown — can chain with any unblocked callable for code execution.

Impact

Severity: CRITICAL
Effect: registers arbitrary callable for deferred execution at interpreter shutdown — can chain with any unblocked callable for code execution
Bypass class: Module blocklist gap

Reproduction

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

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