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

Quick assessment

Affected
vllm-project vllm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 vLLM 0.31.0 之前的版本中，对于 接口请求，若 参数为 ，系统会跳过 的校验。这会导致 的输入线程因未捕获的 异常而终止，而与此同时 健康检查接口仍返回 200 状态码。未经身份验证的远程攻击者可发送一条包含超大 值的请求，从而导致所有后续生成请求被挂起，直至手动重启服务。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-114051

Vulnerability Information
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Vulnerability Title
vLLM before 0.31.0 Denial of Service via min_tokens in /inference/v1/generate
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vllm-project vllm 0 ~ 0.31.0 -

II. Public POCs for CVE-2026-114051

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III. Intelligence Information for CVE-2026-114051

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Other References for CVE-2026-114051 (2)

Same Patch Batch · vllm-project · 2026-10-21 · 7 CVEs total

CVE-2026-114053 8.1 HIGH vLLM 0.7.3 before 0.31.0 RCE via mm_processor_kwargs.code_revision
CVE-2026-114050 7.5 HIGH vLLM before 0.31.0 Remote Engine Crash via Forged Multimodal UUID
CVE-2026-114055 7.5 HIGH vLLM 0.7.3 before 0.31.0 DoS via Unvalidated mm_processor_kwargs
CVE-2026-114052 7.5 HIGH vLLM 0.25.0 before 0.31.0 MOSS-Audio Memory Exhaustion via /tokenize mm_processor_kwargs
CVE-2026-114054 6.5 MEDIUM vLLM before 0.31.0 Cross-Request Cache Aliasing via EXIF ImageID and Prefix-Cache Keys
CVE-2026-114049 3.7 LOW vLLM before 0.31.0 Stale allowed_token_ids Mask via InputBatch.condense

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-248

V. Comments for CVE-2026-114051

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