A deserialization vulnerability exists in Volcengine's verl 3.0.0, specifically in the scripts/model_merger.py script when using the "fsdp" backend. The script calls torch.load() with weights_only=False on user-supplied .pt files, allowing attackers to execute arbitrary code if a maliciously crafted model file is loaded. An attacker can exploit this by convincing a victim to download and place a malicious model file in a local directory with a specific filename pattern. This vulnerability may lead to arbitrary code execution with the privileges of the user running the script.
History

Tue, 19 Aug 2025 20:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-77
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 19 Aug 2025 14:00:00 +0000

Type Values Removed Values Added
Description A deserialization vulnerability exists in Volcengine's verl 3.0.0, specifically in the scripts/model_merger.py script when using the "fsdp" backend. The script calls torch.load() with weights_only=False on user-supplied .pt files, allowing attackers to execute arbitrary code if a maliciously crafted model file is loaded. An attacker can exploit this by convincing a victim to download and place a malicious model file in a local directory with a specific filename pattern. This vulnerability may lead to arbitrary code execution with the privileges of the user running the script.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2025-08-19T00:00:00.000Z

Updated: 2025-08-19T19:44:17.392Z

Reserved: 2025-06-16T00:00:00.000Z

Link: CVE-2025-50461

cve-icon Vulnrichment

Updated: 2025-08-19T19:44:10.308Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-08-19T14:15:39.533

Modified: 2025-08-20T14:40:17.713

Link: CVE-2025-50461

cve-icon Redhat

No data.