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CVE-2026-48746

vLLM: OpenAI auth bypass

Published: Jun 22, 2026Updated: Jun 23, 2026 Sources: CVE List NVDCWE-444
9.1CRITICAL
NVD MITRE
EPSS Score
0.7%
Top 50.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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

AV:NAC:LPR:NUI:NS:UC:HI:NA:H
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

Affected Products

vllmvllm-project
Mixed
AI / ML / llm-serving-inference
vllm-projectoss-projectAI / MLaka vllm, vllm-project/vllm

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

Timeline

Published
Jun 22, 2026
Last Updated
Jun 23, 2026
News mentions
1

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