ModelScan Regularizer & Constraint from_config Bypass

What This Is

ModelScan only checks Lambda layers. Regularizers and constraints embedded inside layer configs (kernel_regularizer, bias_regularizer, kernel_constraint, bias_constraint) are completely ignored.

This .keras file uses both a custom regularizer and a custom constraint, each with malicious from_config(). ModelScan reports 0 Issues. Loading triggers both payloads.

Verify

python3 poc.py

Attack Surface

Layer config sub-fields not scanned by ModelScan:

kernel_regularizer / bias_regularizer / activity_regularizer
kernel_constraint / bias_constraint
kernel_initializer / bias_initializer (separate bypass)

Disclosure

Submitted to ProtectAI via huntr.dev.

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