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CVE-2026-48746

CRITICAL 9.1 PoC AVAILABLE

Published 2026-06-22 · Last modified 2026-07-21

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.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. Modeled probability is still low, but the barrier to attack is reduced — watch closely.

Exploitation likelihood

1.0%chance of exploitation in 30 days · 59th percentile

○ In CISA KEV ● Public exploit / PoC

Impact if exploited

9.1CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-48746/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-48746/poc.json

Affected

Vendors Vllm Project Red Hat Vllm

Products Vllm Red Hat Ai Inference Server 3.2 Red Hat Ai Inference Server 3.3 Red Hat Ansible Automation Platform 2.6 Red Hat Ansible Automation Platform 2.7 Red Hat Openshift Ai 2.25 Exploit Intelligence Migration Toolkit For Applications 8 Openshift Lightspeed Red Hat Ai Inference Server Red Hat Ansible Automation Platform 2 Red Hat Enterprise Linux Ai (Rhel Ai) 3

Weakness (CWE)

  • CWE-444: : Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
  • CWE-501: Trust Boundary Violation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Known Affected Software Configurations

VendorProductVersion range
VllmVllm≥ 0.3.0 and < 0.22.0

All CVSS metrics

  • CRITICAL 9.1 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
  • CRITICAL 9.1 v3.1 · ADP Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
  • CRITICAL 9.1 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

Exploits & PoC

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS