CosyVoice thru commit 6e01309e01bc93bbeb83bdd996b1182a81aaf11e (2025-30-21) contains an insecure deserialization vulnerability (CWE-502) in its model loading component.
Date: 2026-05
Attack vector: deserialization
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-31249
CVE-2026-31250
CVE-2026-31252
CWE: CWE-502
CWE-915
CWE-94
CVSS: 5.7 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L)

CosyVoice thru commit 6e01309e01bc93bbeb83bdd996b1182a81aaf11e (2025-30-21) contains an insecure deserialization vulnerability (CWE-502) in its model loading component. The framework uses torch.load() to load model weight files (e.g., llm.pt, flow.pt, hift.pt) without enabling the security-restrictive weights_only=True parameter. This allows the deserialization of arbitrary Python objects via the pickle module. An attacker can exploit this by providing a malicious model directory containing specially crafted model files. When a victim starts the CosyVoice Web UI pointing to this directory, arbitrary code is executed on the victim's system during the model loading process.


Mitigations:

Architectural layers (MAESTRO):