What’s Vulnerable › Vulnerabilities

CVE-2026-48746: vLLM: OpenAI auth bypass

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-22 · updated 2026-10-25
• Weakness: CWE-444

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: from 0.3.0 before 0.22.0 — fixed in 0.22.0

How to fix

Upgrade to a fixed version: vllm-project vllm 0.22.0. Check the vendor advisory for mitigations.

References

• https://github.com/vllm-project/vllm/pull/43426
• https://github.com/vllm-project/vllm/security/advisories/GHSA-94f4-hr76-p5j6
• https://x41-dsec.de/lab/advisories/x41-2026-002-starlette
• https://access.redhat.com/errata/RHSA-2026:30088
• https://access.redhat.com/errata/RHSA-2026:30089
• https://access.redhat.com/errata/RHSA-2026:36005
• https://access.redhat.com/errata/RHSA-2026:36006
• https://access.redhat.com/errata/RHSA-2026:42132
• https://access.redhat.com/errata/RHSA-2026:42142
• https://access.redhat.com/errata/RHSA-2026:42644
• https://access.redhat.com/errata/RHSA-2026:43038
• https://access.redhat.com/errata/RHSA-2026:61627

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