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PyTorch v1.3 Scanner Bypass PoC

Vulnerability Summary

Format: PyTorch v1.3 (.pt) Scanner Bypass: modelscan 0.8.7 (PyTorchUnsafeOpScan) + picklescan 1.0.1 (DUAL BYPASS) Impact: Arbitrary Code Execution

Key Finding

modelscan ACTIVELY SCANS this file with PyTorchUnsafeOpScan but still reports "No issues found." The joblib numpy byte interleaving technique crashes pickletools.genops() before reaching the malicious reduce call, causing the scanner to silently fail.

Reproduction

modelscan -p malicious_pytorch_v13.pt    # Uses PyTorchUnsafeOpScan, reports no issues
picklescan -p malicious_pytorch_v13.pt   # Reports no issues
python3 -c "import joblib; joblib.load('malicious_pytorch_v13.pt')"  # ACE confirmed

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