CVE-2025-48944
Medium
Description
vLLM is an inference and serving engine for large language models (LLMs). In version 0.8.0 up to but excluding 0.9.0, the vLLM backend used with the /v1/chat/completions OpenAPI endpoint fails to validate unexpected or malformed input in the "pattern" and "type" fields when the tools functionality is invoked. These inputs are not validated before being compiled or parsed, causing a crash of the inference worker with a single request. The worker will remain down until it is restarted. Version 0.9.0 fixes the issue.
SeverityMedium
CVSS6.5
Exploit probability—
ProductVllm
PublishedMay 30, 2025
First seenMay 30, 2025
Weakness typeCWE-20Improper input validation
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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