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joblib-legacy

Joblib
security
poc
legacy-format
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Joblib legacy compatibility hardening-bypass PoC

This repository contains a proof-of-concept artifact for a Joblib finding titled:

Security hardening bypass in legacy NDArrayWrapper compatibility loader defeats caller find_class restrictions

Files:

  • old.pkl: legacy Joblib compatibility wrapper
  • payload.npy: companion NumPy object array containing the payload
  • reproduce.py: deterministic repro script

The payload is intentionally harmless and only attempts to create /tmp/joblib_hf_poc_triggered when loaded through the vulnerable path.

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