CVE-2026-116181: vLLM from 0.20.1 before 0.29.0 contains an improper input validation vulnerability that allows remote attackers to crash

vLLM from 0.20.1 before 0.29.0 contains an improper input validation vulnerability that allows remote attackers to crash the engine by supplying out-of-vocabulary stop_token_ids. Attackers can send OpenAI chat, completion, generate, or batch requests with invalid IDs to terminate the engine or write outside the V2 runner's logits buffer.