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CVE-2026-48746

Vllm authentication bypass

9.1 CRITICALEPSS 1.15%
  1. Published22 Jun 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

Vllm≥ 0.3.0 < 0.22.0

Remediation

Fixed in
Vllm≥ 0.22.0

References

and 6 more references

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Frequently asked

Is CVE-2026-48746 being actively exploited?

CVE-2026-48746 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.15%.

How severe is CVE-2026-48746?

CVE-2026-48746 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 1.15% probability of exploitation.

Which products are affected by CVE-2026-48746?

Affected products include Vllm.

How do I fix CVE-2026-48746?

Upgrade affected software to a fixed version, for example Vllm 0.22.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-48746 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.