---
cve: "CVE-2026-31252"
severity: "MEDIUM"
cvss: 5.7
epss: "11%"
vendor: "n/a"
kev: false
exploited: false
published: "2026-05-11 17:16:20"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T03:54:25+02:00"
---

# CVE-2026-31252

> 5.7 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Erforderlich | good |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Schwachstellen-Klasse

- **CWE-502** — Deserialization of Untrusted Data
  The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

## Angriffsmuster (CAPEC)

- [CAPEC-586 — Object Injection](https://capec.mitre.org/data/definitions/586.html) _(Severity: High)_

## Referenzen

- <https://github.com/FunAudioLLM/CosyVoice>
- <https://www.notion.so/CVE-2026-31252-35d1e139318881ef8acfcd877a432569>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-31252) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_