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modelscan-bypass-xml-sax

Security Research — Modelscan Bypass PoC

Severity: MEDIUM

Module: xml.sax

Description: SAX XML parser creation — potential XXE/SSRF

Impact: Creates SAX parser. Can be configured to resolve external entities for XXE attacks.

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 xml.sax 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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