CVE-2026-48746

CRITICAL 9.1

vLLM: OpenAI auth bypass

CVSS Score

9.1

EPSS Score

1.0%

EPSS Percentile

59th

vLLM is an inference and serving engine for large language models (LLMs). From 0.3.0 until 0.22.0, a vulnerability in ASGI web servers and starlette's trust on those web servers enables an authentication bypass of the OpenAI API AuthenticationMiddleware. It allows to use the API without providing the configured VLLM_API_KEY or --api-key. This vulnerability is fixed in 0.22.0.

CWE	CWE-444
Vendor	vllm-project
Product	vllm
Published	Jun 22, 2026
Last Updated	Jul 22, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Affected Versions

vllm-project / vllm

>= 0.3.0, < 0.22.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗