CVE-2025-50461Public exploit

Code execution via unsafe FSDP model deserialization

Published Aug 19, 2025 · Updated Aug 19, 2025

Unsafe deserialization in Volcengine verl 3.0.0 allows attackers to execute arbitrary code via a crafted FSDP model file. The scripts/model_merger.py FSDP path calls torch.load with weights_only=False on matching .pt files, permitting pickle payloads to invoke arbitrary functions. Exploitation requires the file to be placed in the selected local model directory and the victim to run the merger, so code executes with that user's privileges.

CVSS severity6.5
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Volcengine verl 3.0.0 allows attackers to execute arbitrary code via a crafted FSDP model file. The scripts/model_merger.py FSDP path calls torch.load with weights_only=False on matching .pt files, permitting pickle payloads to invoke arbitrary functions. Exploitation requires the file to be placed in the selected local model directory and the victim to run the merger, so code executes with that user's privileges.

The record

CVE
CVE-2025-50461
Published
Aug 19, 2025
Updated
Aug 19, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1204.002
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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