README.md

fairseq Multi-Vector RCE — Proof of Concept

Demonstrates arbitrary code execution in fairseq 0.12.2 via:

1. Pickle RCE — torch.load(weights_only=False) in checkpoint_utils.py:340
2. eval() injection — eval_str_list() in utils.py:791 (15+ call sites)
3. Shell injection — post_save_script → subprocess.call() in audio_pretraining.py:253

Reproduction

git clone https://github.com/facebookresearch/fairseq
cd fairseq
pip install -e .
python exploit.py
cat /tmp/fairseq_rce_proof.json

Files

• exploit.py — Full PoC demonstrating all 3 vectors with proof output
• create_poisoned_checkpoint.py — Standalone poisoned .pt generator

Impact

228 vulnerable call sites across the fairseq codebase. Every model checkpoint load is an RCE vector.