What’s Vulnerable › Vulnerabilities

CVE-2025-50461

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-19 · updated 2026-06-17
• Weakness: CWE-77

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

• https://github.com/Anchor0221/CVE-2025-50461
• https://github.com/pytorch/pytorch/blob/main/SECURITY.md#loading-untrusted-data
• https://github.com/volcengine/verl
• https://github.com/volcengine/verl/blob/main/scripts/model_merger.py#L152
• https://pytorch.org/docs/stable/generated/torch.load.html

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