CVE-2026-48746: Vllm

Critical severity, CVSS 9.1. EPSS: 1.2% chance of exploitation in the next 30 days.

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.

Affected products

• Vllm Vllm: from 0.3.0, before 0.22.0 (fixed in 0.22.0)

Published 2026-06-22. Last modified 2026-09-16.