{"schemaVersion":3,"id":"CVE-2025-62426","aliases":["GHSA-69j4-grxj-j64p","PYSEC-2026-2012","CGA-m4m4-r269-3cm9"],"status":"published","duplicateOf":null,"title":null,"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. 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