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NeMo vLLM tokenizer Hydra instantiate RCE PoC

This PoC demonstrates that nemo.export.vllm.model_config.NemoModelConfig instantiates the model-controlled tokenizer._target_ from context/model.yaml before validating that the tokenizer target is a Hugging Face tokenizer.

The malicious NeMo2-style model artifact is:

malicious_nemo2_ckpt/context/model.yaml

The tokenizer._target_ uses Hydra to call pydoc.pipepager, which executes a local command and creates nemo_vllm_marker.txt during model config loading.

Run:

python build_and_verify.py

Expected result:

marker_created=true
marker_text="nemo_vllm_modelconfig_rce"

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