CVE-2026-48746

Q: How do I fix CVE-2026-48746?

Upgrade vllm to 0.22.0 or later.

Q: Is CVE-2026-48746 being actively exploited?

Not that we know of. CVE-2026-48746 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.2% is the estimated probability that it will be exploited in the next 30 days. That is higher than 67% of all scored CVEs.

Q: How severe is CVE-2026-48746?

CVE-2026-48746 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-48746 affect?

Published advisories record a fix for vllm (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICAL

9.1

CVSS v3

NVD

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.

CWE-444 CWE-501

How to fix

Remediation Available

vllmNVD

Affected:>= 0.3.0, < 0.22.0Fixed in:0.22.0CVE-2026-48746derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.15%probability of exploitation in 30 days

67thpercentile

Moderate risk: more likely to be exploited than 67% of all known CVEs.

References

Third-Party Advisory2

Issue Tracking1

github.com

Other references13

Related Vulnerabilities

Other CWE-444 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-22536	Critical	10.0	98%	KEV	-
CVE-2025-61884	High	7.5	96%	KEV + Ransom	-
CVE-2020-9490	High	7.5	89%	-	Fix
CVE-2023-41265	Critical	9.6	88%	KEV + Ransom	-
CVE-2023-25690	Critical	9.8	85%	-	Fix
CVE-2022-32214	Medium	6.5	82%	-	Fix

Common questions

How do I fix CVE-2026-48746?

Upgrade vllm to 0.22.0 or later.

Is CVE-2026-48746 being actively exploited?

Not that we know of. CVE-2026-48746 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.2% is the estimated probability that it will be exploited in the next 30 days. That is higher than 67% of all scored CVEs.

How severe is CVE-2026-48746?

CVE-2026-48746 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-48746 affect?

Published advisories record a fix for vllm (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-16.