CVE-2026-114051

vLLM before 0.31.0 Denial of Service via min_tokens in /inference/v1/generate

Published Oct 21, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

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

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

vllm-project

vllm

unaffected

Version	Status	Constraints
`0`	affected	< 0.31.0
`0.31.0`	unaffected	—

Configuration 1 [-]

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*

No data.

Vendor Product Versions

Vllm

Version	Status	Scheme	Platform
`[0,0.31.0)`	affected	semver	—
`0.31.0`	unaffected	semver	—

Vllm-project

Vllm

Version	Status	Scheme	Platform
`[0,0.31.0)`	affected	semver	—
`0.31.0`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.383% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://github.com/vllm-project/vllm/security/advisories/GHSA-4xqp-c3mv-qff7
https://nvd.nist.gov/vuln/detail/CVE-2026-114051
https://www.cve.org/CVERecord?id=CVE-2026-114051
https://www.vulncheck.com/advisories/vllm-before-0.31.0-denial-of-service-via-min-tokens-in-inference-v1-generate

History

Oct 28, 2026 4:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 22, 2026 12:30 PM First appearance in the feed. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
First Time appeared		Vllm-project Vllm-project vllm
Vendors & Products		Vllm-project Vllm-project vllm
References		https://nvd.nist.gov/vuln/detail/CVE-2026-114051 https://www.cve.org/CVERecord?id=CVE-2026-114051
Metrics	threat_severity `None`	threat_severity `Important`

Oct 21, 2026 12:45 AM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		vLLM before 0.31.0 Denial of Service via min_tokens in /inference/v1/generate
First Time appeared		Vllm Vllm vllm
Weaknesses		CWE-248
CPEs		cpe:2.3:a:vllm:vllm::::::::
Vendors & Products		Vllm Vllm vllm
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
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}` cvssV4_0 `{'score': 7.1, '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'}`