LLMMedium
CVE-2025-62426: vLLM is an inference and serving engine for large language models (LLMs). From version 0.5.5 to befo…
- Occurred
- Nov 21, 2025
- Published
- Nov 21, 2025
- Source
- NVD CVE
Summary
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.
Tags
- CVE
- CVE-2025-62426
- cvss:MEDIUM
Classification
Category confidence: 95%
Severity confidence: 90%
Rationale: CVE describes a denial-of-service vulnerability in vLLM LLM serving engine affecting API availability.
Classifier: Qwen/Qwen3.5-35B-A3B-FP8