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Fencer Vulns
critical 9.1

CVE-2026-48746 json

vLLM: OpenAI auth bypass

published 2026-06-16 4 mo ago modified 2026-10-25 14 d ago also GHSA-94f4-hr76-p5j6 , PYSEC-2026-226 , EUVD-2026-38401

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi vllm 0.22.0
  • Red Hat Red Hat AI Inference Server 3.2 1782951012, 1782951244, 1787860580, 1787884873
  • Red Hat Red Hat AI Inference Server 3.3 1782352847, 1782353093
  • Red Hat Red Hat Ansible Automation Platform 2.6 1783920640
  • Red Hat Red Hat Ansible Automation Platform 2.7 1783918403
  • Red Hat Red Hat Migration Toolkit for Applications 8.2 1784109883
  • Red Hat Red Hat OpenShift AI 2.25 1783082430

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-48746 updated cvss 9.1

vllm: starlette: vLLM: Critical authentication bypass allows unauthorized API access

  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-service-api-rhel9, openshift-lightspeed/lightspeed-agentic-sandbox-rhel9
    affected: workaround, no fix available
  • Red Hat AI Inference Server rhaii/vllm-tpu-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, rhaii/vllm-gaudi-rhel9, rhaii/vllm-neuron-rhel9, rhaiis/vllm-spyre-rhel9, +1 more
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-25/lightspeed-chatbot-rhel8, ansible-automation-platform-26/lightspeed-chatbot-rhel9, ansible-automation-platform-27/lightspeed-chatbot-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-gaudi-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-vllm-gaudi-rhel9, rhoai/odh-llm-d-kv-cache-rhel9, rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9, rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9, rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9, rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9, +9 more
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat AI Inference Server 3.2 rhaiis/vllm-cuda-rhel9 1782951012, rhaiis/vllm-cuda-rhel9 1787860580, rhaiis/vllm-rocm-rhel9 1782951244, rhaiis/vllm-rocm-rhel9 1787884873
    fixed: vendor fix RHSA-2026:61627
  • Red Hat AI Inference Server 3.3 rhaiis/vllm-cuda-rhel9 1782352847, rhaiis/vllm-rocm-rhel9 1782353093
    fixed: vendor fix RHSA-2026:30089
  • Red Hat AI Inference Server 3.4 rhaii/vllm-cpu-rhel9 1789681128, rhaii/vllm-cpu-rhel9 1790075793, rhaii/vllm-cuda-rhel9 1789681126, rhaii/vllm-cuda-rhel9 1790090131, rhaii/vllm-rocm-rhel9 1789681126, rhaii/vllm-rocm-rhel9 1790109620, +2 more
    fixed: vendor fix RHSA-2026:69466
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26/mcp-tools-rhel9 1783920640
    fixed: vendor fix RHSA-2026:42132
show 11 more
  • Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/mcp-tools-rhel9 1783918403
    fixed: vendor fix RHSA-2026:42142
  • Red Hat Enterprise Linux AI 3.4 rhelai3/bootc-cuda-rhel9 1790868254, rhelai3/bootc-rocm-rhel9 1790614447, rhelai3/bootc-aws-cuda-rhel9 1790881122, rhelai3/bootc-gcp-cuda-rhel9 1790881123, rhelai3/disk-image-cuda-rhel9 1790957417, rhelai3/bootc-azure-cuda-rhel9 1790881120, +1 more
    fixed: vendor fix RHSA-2026:76150
  • Red Hat Migration Toolkit for Applications 8.2 mta/mta-solution-server-rhel9 1784109883
    fixed: vendor fix RHSA-2026:43038
  • Red Hat OpenShift AI 2.25 rhoai/odh-feature-server-rhel9 1792148523, rhoai/odh-built-in-detector-rhel9 1791364320, rhoai/odh-caikit-tgis-serving-rhel9 1783082430
    fixed: vendor fix RHSA-2026:87410
  • Red Hat OpenShift AI 3.3 rhoai/odh-feature-server-rhel9 1789745631, rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9 1790085310
    fixed: vendor fix RHSA-2026:73987
  • Red Hat OpenShift AI 3.4 rhoai/odh-feature-server-rhel9 1791863220, rhoai/odh-built-in-detector-rhel9 1791537794, rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9 1791785804, rhoai/odh-guardrails-detector-huggingface-runtime-rhel9 1791535841
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9
    not affected: component not present
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26/hub-rhel9 1783979593, ansible-automation-platform-26/gateway-rhel9 1783969842, ansible-automation-platform-26/hub-web-rhel9 1783982443, ansible-automation-platform-26/receptor-rhel9 1783962464, ansible-automation-platform-26/controller-rhel9 1783973764, ansible-automation-platform-26/de-minimal-rhel9 1783921549, +24 more Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/hub-rhel9 1783919521, ansible-automation-platform-27/gateway-rhel9 1783919486, ansible-automation-platform-27/hub-web-rhel9 1783921568, ansible-automation-platform-27/receptor-rhel9 1783917963, ansible-automation-platform-27/controller-rhel9 1783921344, ansible-automation-platform-27/de-minimal-rhel9 1783918892, +25 more
    not affected: vulnerable code not present
  • Red Hat Hardened Images jaeger
    not affected: component not present
  • Red Hat Migration Toolkit for Applications 8.2 mta/mta-ui-rhel9 1783962515, mta/mta-cli-rhel9 1784211378, mta/mta-hub-rhel9 1784059743, mta/mta-rhel9-operator 1784219586, mta/mta-operator-bundle 1784220119, mta/mta-analyzer-addon-rhel9 1784163267, +7 more Red Hat OpenShift AI (RHOAI) rhoai/odh-automl-rhel9, rhoai/odh-mlflow-rhel9, rhoai/odh-mlserver-rhel9, rhoai/odh-caikit-nlp-rhel9, rhoai/odh-kserve-agent-rhel9, rhoai/odh-kserve-router-rhel9, +10 more Red Hat OpenShift AI 2.25 rhoai/odh-rhel9-operator 1784004914, rhoai/odh-rhel9-operator 1792570619, rhoai/odh-vllm-cpu-rhel9 1782397826, rhoai/odh-vllm-cpu-rhel9 1792018436, rhoai/odh-dashboard-rhel9 1782826282, rhoai/odh-dashboard-rhel9 1791853525, +139 more Red Hat OpenShift AI 3.3 rhoai/odh-cli-rhel9 1790070206, rhoai/rhai-cli-rhel9 1790070206, rhoai/odh-mlflow-rhel9 1789653606, rhoai/odh-trainer-rhel9 1790136369, rhoai/odh-maas-api-rhel9 1790131842, rhoai/odh-mlserver-rhel9 1789121365, +75 more Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1791509689, rhoai/rhai-cli-rhel9 1791509689, rhoai/odh-automl-rhel9 1791535789, rhoai/odh-mlflow-rhel9 1791865967, rhoai/odh-autorag-rhel9 1791557539, rhoai/odh-trainer-rhel9 1791869783, +96 more
    not affected: vulnerable code not present
  • Red Hat Satellite 6 satellite/iop-vmaas-rhel9, satellite/foreman-mcp-server-rhel9, satellite/iop-advisor-engine-rhel9, satellite/iop-host-inventory-rhel9, satellite/iop-vulnerability-engine-rhel9
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

1.15% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • x41-dsec.de https://x41-dsec.de/lab/advisories/x41-2026-002-starlette referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
OSV 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi vllm
>=0.3.0, <0.22.0
0.22.0

Affected products

  • vllm-project vllm
  • Red Hat Red Hat AI Inference Server 3.2
  • Red Hat Red Hat AI Inference Server 3.3
  • Red Hat Red Hat Ansible Automation Platform 2.6
  • Red Hat Red Hat Ansible Automation Platform 2.7
  • Red Hat Red Hat Migration Toolkit for Applications 8.2
  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Exploit Intelligence
  • Red Hat OpenShift Lightspeed
  • Red Hat Red Hat AI Inference Server
  • Red Hat Red Hat Ansible Automation Platform 2
  • Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat Satellite 6

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests
  • CWE-501 Trust Boundary Violation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.