CVE-2025-48942
Medium
Description
vLLM is an inference and serving engine for large language models (LLMs). In versions 0.8.0 up to but excluding 0.9.0, hitting the /v1/completions API with a invalid json_schema as a Guided Param kills the vllm server. This vulnerability is similar GHSA-9hcf-v7m4-6m2j/CVE-2025-48943, but for regex instead of a JSON schema. Version 0.9.0 fixes the issue.
SeverityMedium
CVSS6.5
Exploit probability—
ProductVllm
PublishedMay 30, 2025
First seenMay 30, 2025
Weakness typeCWE-248CWE-248
How to fix
Update
- vllm vllm0.9.0 or later
- vllm0.9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vllm vllm | 0.8.0 ≤ v < 0.9.0 | 0.9.0 |
| vllmPyPI | 0.8.0 ≤ v < 0.9.0 | 0.9.0 |
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