CVE-2025-50461 Deserialization in n/a
Attackers can execute arbitrary code by tricking users into loading malicious model files in the Volcengine verl library's model merger script.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-50461?
CVE-2025-50461 is a medium-severity unsafe deserialization vulnerability in n/a, published on 19 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-77
Which versions are affected by CVE-2025-50461?
How do I fix CVE-2025-50461?
No fix has been published for CVE-2025-50461 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-50461 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-50461 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-xhf5-3r9v-mm67.