CVE-2026-48746: vLLM: OpenAI auth bypass
(updated )
A vulnerability in ASGI web servers and starlette’s trust on those web servers enables an authentication bypass of the OpenAI API AuthenticationMiddleware, which was discovered during @x41sec’s source code audit.
It allows to use the API without providing the configured VLLM_API_KEY or --api-key.
References
- access.redhat.com/errata/RHSA-2026:30088
- access.redhat.com/errata/RHSA-2026:30089
- access.redhat.com/errata/RHSA-2026:36005
- access.redhat.com/errata/RHSA-2026:36006
- access.redhat.com/errata/RHSA-2026:42132
- access.redhat.com/errata/RHSA-2026:42142
- access.redhat.com/errata/RHSA-2026:42644
- access.redhat.com/errata/RHSA-2026:43038
- access.redhat.com/errata/RHSA-2026:61627
- access.redhat.com/errata/RHSA-2026:61629
- access.redhat.com/security/cve/CVE-2026-48746
- bugzilla.redhat.com/show_bug.cgi?id=2491581
- github.com/advisories/GHSA-94f4-hr76-p5j6
- github.com/pypa/advisory-database/tree/main/vulns/vllm/PYSEC-2026-226.yaml
- github.com/vllm-project/vllm/pull/43426
- github.com/vllm-project/vllm/security/advisories/GHSA-94f4-hr76-p5j6
- nvd.nist.gov/vuln/detail/CVE-2026-48746
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48746.json
- x41-dsec.de/lab/advisories/x41-2026-002-starlette
Code Behaviors & Features
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