CVE-2026-48746
vLLM: OpenAI auth bypass
- State
- Published
- Severity
- 9.1 Critical
- Published
- Jun 22, 2026
- Updated
- Sep 16, 2026
- Reserved
- May 22, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H | GitHub_M |
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
vllmvllm-project |
|
References
- https://github.com/vllm-project/vllm/security/advisories/GHSA-94f4-hr76-p5j6
- https://github.com/vllm-project/vllm/pull/43426
- https://x41-dsec.de/lab/advisories/x41-2026-002-starlette
- https://access.redhat.com/security/cve/CVE-2026-48746vdb-entry
- RHBZ#2491581issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48746.json
- https://access.redhat.com/errata/RHSA-2026:61627vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36005vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:61629vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36006vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:30089vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:30088vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:42132vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:42142vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:43038vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:42644vendor-advisory
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