TI-2026-78664 Aliases CVE-2026-114051

Denial of service in vLLM via min_tokens in /inference/v1/generate

LOW 37CWE-248Published 2026-10-21 · Updated 2026-10-28

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 3 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-248.

Summary

vLLM before 0.31.0 skips the min_tokens and max_tokens check for /inference/v1/generate requests when max_tokens is null. The EngineCore input thread then dies on an uncaught exception (CWE-248), while /health still returns 200. An unauthenticated remote attacker can send one request with an oversized min_tokens to hang all later generation requests until the service is restarted manually.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00383 32nd percentileScored 2026-11-07

Fix Partial vllm (vllm-project): 0.31.0Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
vllm-project	vllm	before 0.31.0	0.31.0	Patch available	CNA

vllm Vendorvllm-project Affected before 0.31.0 Fixed in 0.31.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:vllm:vllm::::::::	before 0.31.0	Vulnerable	vLLM

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:* Versions before 0.31.0 Vulnerable ·vLLM

Remediation

Update vLLM to 0.31.0, which fixes the flaw. The sources list no fixed version for Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, or Red Hat OpenShift AI (RHOAI).

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA vllm (vllm-project) Fixed in 0.31.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-21
vllm-project vllm 0.31.0
7 records Highest priority Priority MEDIUM 3 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2026-78668 Uncontrolled resource use in vLLM lets clients exhaust server memoryPriority MEDIUM 44
- TI-2026-78665 Memory exhaustion in vLLM MOSS-Audio serving through /tokenizePriority MEDIUM 44
- TI-2026-78666 Remote code execution in vLLM via mm_processor_kwargs.code_revisionPriority MEDIUM 42
Show all 7 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat AI Inference Server	Affected	No fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3	Affected	No fix yet
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet

Not affected: 1 product

Red Hat OpenShift AI (RHOAI)

Timeline

2026-10-21 Threatist record created from CVE-2026-114051
2026-10-21 Affected versions changed · Red Hat
2026-10-21 CVSS score added · Red Hat
2026-10-22 Priority changed: MEDIUM → LOW
2026-10-23 Affected versions changed · Red Hat
2026-10-28 CISA SSVC decision points changed

References

Advisory 1

GitHub Security Advisory (GHSA-4xqp-c3mv-qff7)

TI-2024-10229 Remote Code Execution in vllm-project/vllm CVSS 3.0CRITICAL 9.8
TI-2024-08404 Remote Code Execution in vllm-project/vllm CVSS 3.1CRITICAL 9.8
TI-2026-36017 vLLM: OpenAI auth bypass CVSS 3.1CRITICAL 9.1
TI-2026-63056 vLLM before 0.28.0 Denial of Service via negative token ID CVSS 4.0HIGH 8.7
TI-2026-04308 Hardcoded trust_remote_code=True in vllm-project/vllm Bypasses User Security Control CVSS 3.0HIGH 8.8
TI-2026-39137 vLLM: Remote DoS in vLLM via Invalid Recovered Token Reinjection CVSS 3.1HIGH 7.5

See all 124 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences