CRITICAL 9.1

PYSEC-2026-226

Details

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.

Are you affected?

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Affected packages

PyPI / vllm

Introduced in: 0.3.0 Fixed in: 0.22.0

Fix pip install --upgrade 'vllm>=0.22.0'

References

https://github.com/vllm-project/vllm/security/advisories/GHSA-94f4-hr76-p5j6 [ADVISORY]
https://x41-dsec.de/lab/advisories/x41-2026-002-starlette [ADVISORY]
https://github.com/vllm-project/vllm/pull/43426 [REPORT]