CVE-2026-48746

vLLM: OpenAI auth bypass

Published: Jun 22, 2026Updated: Sep 16, 2026 Sources: CVE List NVDCWE-444

9.1CRITICAL

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-444 CWE-501

Affected Products

vllm-project

oss-projectaka vllm, vllm-project/vllm

vllmMixed

AI / ML / llm-serving-inference

vllm

oss-projectaka aibrix

vllmMixed

AI / ML / llm-serving-inference

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Collection

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References

https://github.com/vllm-project/vllm/security/advisories/GHSA-94f4-hr76-p5j6

github.com

https://github.com/vllm-project/vllm/pull/43426

github.com

https://x41-dsec.de/lab/advisories/x41-2026-002-starlette

x41-dsec.de

and 13 more references View all →

News mentions

⚡ Weekly Recap: Browser Bugs, EDR Killers, TV Botnet, OpenBSD Flaw, Android Trojan, and More
en·The Hacker News·Jun 22, 2026 Roundup Fortinet FortiGate Icarus

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