High severity · published Oct 21, 2026
CVE-2026-114051
vLLM before 0.31.0 Denial of Service via min_tokens in /inference/v1/generate
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VL
vllm · vllm-project
before 0.31.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-114051
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-114051
github.com
https://github.com/vllm-project/vllm/security/advisories/GHSA-4xqp-c3mv-qff7
www.vulncheck.com
https://www.vulncheck.com/advisories/vllm-before-0.31.0-denial-of-service-via-min-tokens-in-inference-v1-generate
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