Vulnerability · Published Oct 21, 2026 · Assigned by VulnCheck

CVE-2026-114051vLLM before 0.31.0 Denial of Service via min_tokens in /inference/v1/generate

High 7.5

In plain English

A high-severity security flaw in vllm from vllm-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 67.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
vllm-project	vllm	0 – before 0.31.0

Weakness: CWE-248 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-4xqp-c3mv-qff7) vendor-advisory
VulnCheck Advisory: vLLM before 0.31.0 Denial of Service via min_tokens in /inference/v1/generate third-party-advisory