Deserialization Vulnerability in Volcengine's Model Merger Script
CVE-2025-50461

6.5MEDIUM

Key Information:

Vendor

Volcengine

Status
verl
Vendor
CVE Published:
19 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-50461?

A deserialization vulnerability is present in Volcengine's verl 3.0.0, particularly in the model merger script. This flaw arises when the script processes user-supplied .pt files without proper validation while invoking torch.load() with weights_only set to False. An attacker could exploit this vulnerability by designing a malicious model file and persuading a victim to download and store it in a specific local directory. Upon execution, this may permit the attacker to execute arbitrary code with the same privileges as the user running the script.

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Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-50461
Created by Anchor0221

References

https://pytorch.org/docs/stable/generated/torch.load.html
https://github.com/volcengine/verl
https://github.com/volcengine/verl/blob/main/scripts/mode...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability Reserved

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