# CVE-2026-48746

## Summary

- **CVE ID:** CVE-2026-48746
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H)
- **CWE:** CWE-444
- **Published:** Jun 22, 2026
- **Last Modified:** Sep 1, 2026

## 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.

## Affected Products

- vllm-project — vllm (>= 0.3.0, < 0.22.0)

## References

- [CNA](https://github.com/vllm-project/vllm/security/advisories/GHSA-94f4-hr76-p5j6)
- [CNA](https://github.com/vllm-project/vllm/pull/43426)
- [CNA](https://x41-dsec.de/lab/advisories/x41-2026-002-starlette)
- [CISA-ADP](https://x41-dsec.de/lab/advisories/x41-2026-002-starlette/)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-48746)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2491581)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48746.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:30089)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:30088)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36005)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36006)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:42132)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:42142)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:42644)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:43038)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:61627)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:61629)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.15%
- **EPSS Percentile:** 64.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._