CVE-2026-48746 CRITICAL

CVE-2026-48746: vLLM: OpenAI auth bypass

Vendor Vllm-Project
Product vllm
Weakness CWE-444
Published June 22, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

9.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 22, 2026 CVE published
June 30, 2026 Record updated