CVE-2025-62426
Medium
Description
vLLM is an inference and serving engine for large language models (LLMs). From version 0.5.5 to before 0.11.1, the /v1/chat/completions and /tokenize endpoints allow a chat_template_kwargs request parameter that is used in the code before it is properly validated against the chat template. With the right chat_template_kwargs parameters, it is possible to block processing of the API server for long periods of time, delaying all other requests. This issue has been patched in version 0.11.1.
SeverityMedium
CVSS6.5
Exploit probability—
ProductVllm
PublishedNov 21, 2025
First seenNov 21, 2025
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- vllm vllm0.11.1 or later
- vllm0.11.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vllm vllm | 0.5.5 ≤ v < 0.11.1, 0.11.1 | 0.11.1 |
| vllmPyPI | 0.5.5 ≤ v < 0.11.1 | 0.11.1 |
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