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CVE-2026-114051 vLLM before 0.31.0 skips the…

Description

vLLM before 0.31.0 skips the min_tokens <= max_tokens check for /inference/v1/generate requests with a null max_tokens, so the EngineCore input thread later dies on an uncaught VLLMValidationError while /health still returns 200. Unauthenticated remote attackers can send one request with an oversized min_tokens to hang all subsequent generation requests until manual restart.

Affected products and versions

Product Affected versions Fixed in
vllm 0.31 earliest → < 0.31.0 0.31.0

References

Timeline

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