# CVE-2026-31249: FunAudioLLM CosyVoice insecure deserialization in make_parquet_list.py

Source: https://junglewise.ai/threats/cve-2026-31249-funaudiollm-cosyvoice-insecure-deserialization-in-make-parquet  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-11. Updated: 2026-05-14  
License: CC BY 4.0 with a link back

CVE-2026-31249 · Severity: high · CVSS 7.3 · Published 2026-05-11

CosyVoice is a voice generation model used for creating and processing speech data. A security flaw in its data processing tool allows an attacker to execute malicious code on a user's computer if the user is tricked into processing a specially crafted data file. This could lead to a full system compromise, unauthorized data access, or the installation of malware.

Technologies: [FunAudioLLM CosyVoice](https://junglewise.ai/threats/technologies/cosyvoice). Vendors: [FunAudioLLM](https://junglewise.ai/threats/vendors/funaudiollm).

## Quick answers

**Is CVE-2026-31249 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-31249 being exploited in the wild.

**How severe is CVE-2026-31249?** High severity, with a CVSS score of 7.3, published 11 May 2026.

**Which products and versions are affected?** FunAudioLLM CosyVoice up to commit 6e01309e01bc93bbeb83bdd996b1182a81aaf11e.

**Is there a fix for CVE-2026-31249?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-31249 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-31249?** Check whether you run FunAudioLLM CosyVoice at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An insecure deserialization vulnerability (CWE-502) exists in the 'make_parquet_list.py' tool within CosyVoice. The vulnerability stems from the use of 'torch.load()' to process PyTorch (.pt) files—such as utterance and speaker embeddings—without the 'weights_only=True' parameter enabled. Because 'torch.load' uses the Python pickle module by default, it can be coerced into deserializing arbitrary Python objects. An attacker can exploit this by providing a malicious .pt file in a data directory; when a victim runs the processing script on that directory, the attacker's code is executed with the privileges of the user running the script.

## Affected products

- FunAudioLLM CosyVoice up to commit 6e01309e01bc93bbeb83bdd996b1182a81aaf11e

## Timeline

- 2026-05-11: advisory: CVE-2026-31249 published by NVD

## References

- [https://github.com/FunAudioLLM/CosyVoice](https://github.com/FunAudioLLM/CosyVoice)
- [https://www.notion.so/CVE-2026-31249-35d1e13931888112af48f0bddf18f0b9](https://www.notion.so/CVE-2026-31249-35d1e13931888112af48f0bddf18f0b9)

## Related threats

- [FunAudioLLM CosyVoice insecure deserialization in model loading](https://junglewise.ai/threats/cve-2026-31232-funaudiollm-cosyvoice-insecure-deserialization-in-model-loading)
- [FunAudioLLM CosyVoice insecure deserialization in model loading](https://junglewise.ai/threats/cve-2026-31252-funaudiollm-cosyvoice-insecure-deserialization-in-model-loading)
- [FunAudioLLM CosyVoice insecure deserialization in gRPC server](https://junglewise.ai/threats/cve-2026-31251-funaudiollm-cosyvoice-insecure-deserialization-in-grpc-server)
- [FunAudioLLM CosyVoice insecure deserialization in average_model.py](https://junglewise.ai/threats/cve-2026-31250-funaudiollm-cosyvoice-insecure-deserialization-in-average-model)