fix: remove unsafe exec() in deeplab_demo.ipynb

[orbisai0security]

Summary

Fix critical severity security issue in research/deeplab/deeplab_demo.ipynb.

Vulnerability

Field	Value
ID	V-009
Severity	CRITICAL
Scanner	multi_agent_ai
Rule	V-009
File	research/deeplab/deeplab_demo.ipynb:241
CWE	CWE-78

Description: The application loads pre-trained ML models from external sources (Google Cloud ML Engine, savedmodel directories) without cryptographic integrity verification. TensorFlow SavedModel format can contain embedded executable code via tf.py_function, Lambda layers, or custom TensorFlow operations. If a model file is downloaded from a compromised source or if the download channel is intercepted (man-in-the-middle attack), an attacker can substitute a malicious model file containing embedded code that executes arbitrary OS commands when the model is loaded via tf.saved_model.load().

Changes

• research/deeplab/deeplab_demo.ipynb

Verification

• Build passes
• Scanner re-scan confirms fix
• LLM code review passed

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Automated security fix by OrbisAI Security

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