MediumVulnerability

CVE-2025-50461: Volcengine verl deserialization flaw in model_merger.py fsdp backend

Source: NVD(opens in a new tab)
Identifier: CVE-2025-50461
Published: August 19, 2025
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.5%

Summary

A deserialization flaw in Volcengine's verl 3.0.0, in the scripts/model_merger.py script when using the "fsdp" backend, calls torch.load() with weights_only=False on user-supplied .pt files. An attacker who gets a victim to place a maliciously crafted model file in a local directory with a specific filename pattern can execute arbitrary code with the privileges of the user running the script.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 6.5(medium)
EPSS: 0.5%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.

Weaknesses and techniques

Weakness (CWE): CWE-77
Attack pattern (CAPEC): CAPEC-88
AI threat technique (MITRE ATLAS): AML.T0010

Classification

Attack type: Supply chain
Attack sophistication: Moderate
AI component targeted: Framework
Impact: Confidentiality,
Integrity,
Availability
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2025-50461

First tracked: February 15, 2026 at 08:53 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 85% (self-assessed)

Summary

Mitigation

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