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modelscan-bypass-concurrent-futures

Security Research — Modelscan Bypass PoC

Severity: CRITICAL

Module: concurrent.futures

Description: Thread pool executor creation — can submit arbitrary callables

Impact: Creates ThreadPoolExecutor. executor.submit(func, *args) runs any callable in thread pool.

Modelscan Result

$ modelscan scan -p pytorch_model.bin
No issues found! ✅ (FALSE NEGATIVE)

Tested against: modelscan 0.8.8 (latest)

How It Works

The pickle file uses concurrent.futures which is NOT in modelscan's unsafe_globals blocklist. When loaded via torch.load() or pickle.loads(), it executes the payload.

Responsible Disclosure

This PoC is part of responsible security research submitted via Huntr MFV program to help ProtectAI improve modelscan's detection capabilities.

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