CVE-2026-48746Proof of concept (PoC) published · CISASuited to automated attack · CISA

vLLM: OpenAI auth bypass

CVSS score

9.1

EPSS probability

%1.2

Risk score

0.1

Published

3 mo ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-48746 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

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.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-48746 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	vllm-project	vllm	View
2	vllm	vllm	View
3	pypi	vllm	View

Total affected vendors: 3|Products: 3

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
9.1	CVSS V31	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	NVD
9.1	CVSS 3.x	—	Vector not published	GitHub Advisory
9.1	CVSS V3_1	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	CVE CNA
9.1	CVSS V3_1	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H	CVE ADP
0.0	CVSS 4.0	—	Vector not published	GitHub Advisory

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-48746 is associated with the following CWEs:

CWE-444: Common Weakness Enumeration Entry CWE-444 CWE-501: Common Weakness Enumeration Entry CWE-501

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-48746 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

https://github.com/vllm-project/vllm/security/advisories/GHSA-94f4-hr76-p5j6vendor-advisory https://github.com/vllm-project/vllm/pull/43426vendor-advisory https://x41-dsec.de/lab/advisories/x41-2026-002-starlettevendor-advisory https://access.redhat.com/errata/RHSA-2026:30088nvd https://access.redhat.com/errata/RHSA-2026:30089nvd https://access.redhat.com/errata/RHSA-2026:36005nvd https://access.redhat.com/errata/RHSA-2026:36006nvd https://access.redhat.com/errata/RHSA-2026:42132nvd https://access.redhat.com/errata/RHSA-2026:42142nvd https://access.redhat.com/errata/RHSA-2026:42644nvd

CVSS Vector Radar Chart

9.1 / 10

Vulnerability Scoring Details

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

vllm-project

vllm

pypi

Weakness Type (CWE & CAPEC)

CWE-444 CWE-501

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