CVE-2026-48746

CRITICAL

vLLM: OpenAI auth bypass

Title source: cna
STIX 2.1

Description

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.

Scores

CVSS v3 9.1
EPSS 0.0115
EPSS Percentile 63.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-444 CWE-501
Status published
Products (3)
pypi/vllm 0.3.0 - 0.22.0PyPI
vllm/vllm 0.3.0 - 0.22.0
vllm-project/vllm >= 0.3.0, < 0.22.0
Published Jun 22, 2026
Tracked Since Jun 23, 2026