CVE-2026-48746

vLLM: OpenAI auth bypass

At a glance

Severity: CRITICAL 9.1
EPSS: EPSS 1.15 % · percentile 67 (2026-10-27)
State: PUBLISHED
Published: 2026-06-22
Updated: 2026-09-16
Assigner: GitHub_M
NVD status: Modified

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

Version	Score	Vector	Scored by
CVSS 3.1	CRITICAL 9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	GitHub_M
CVSS 3.1	CRITICAL 9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	redhat-SADP
CVSS 3.1	CRITICAL 9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	CRITICAL 9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary)

Weaknesses (CWE)

Advisories

GHSA-94f4-hr76-p5j6 — vLLM: OpenAI auth bypass
PYSEC-2026-226 — 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

European references

ENISA EUVD · EUVD-2026-38401
GCVE · GCVE-0-2026-48746

Affected configurations (NVD CPE)

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:* ≥ 0.3.0 < 0.22.0

Affected products

Product	Versions
vllm-project · vllm	affected >= 0.3.0, < 0.22.0

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD