CVE-2026-48746

Name: CVE-2026-48746
Creator: NVD / NIST
Published: 2026-06-22T23:16:30.49+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.74%

Last modified Jun 24, 2026

CVE-2026-48746 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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. EPSS estimates a 0.74% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

0.74%

49.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-444

Affected Software

Vendor	Product	Versions
Vllm	Vllm	>= 0.3.0, < 0.22.0

References

https://github.com/vllm-project/vllm/pull/43426Issue Tracking
https://github.com/vllm-project/vllm/security/advisories/GHSA-94f4-hr76-p5j6Third Party Advisory
https://x41-dsec.de/lab/advisories/x41-2026-002-starletteThird Party Advisory
https://x41-dsec.de/lab/advisories/x41-2026-002-starletteThird Party Advisory

Timeline

Published: Jun 22, 2026
Last Modified: Jun 24, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-48746?

How severe is CVE-2026-48746?

CVE-2026-48746 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.74% probability of exploitation in the next 30 days.

How do I fix CVE-2026-48746?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-48746?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST