CosyVoice thru commit 6e01309e01bc93bbeb83bdd996b1182a81aaf11e (2025-30-21) contains an insecure deserialization vulnerability (CWE-502) in its average_model.py model averaging tool. The script loads PyTorch checkpoint files (epoch_*.pt) for model averaging using torch.load() without enabling the weights_only=True security parameter. This allows the deserialization of arbitrary Python objects via the pickle module. An attacker can exploit this by providing malicious checkpoint files within a directory. When a victim uses the tool to average models from this directory, arbitrary code is executed on the victim's system.

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-31250
• https://github.com/FunAudioLLM/CosyVoice
• https://www.notion.so/CVE-2026-31250-35d1e13931888147a9a3e1c5e239a0a7