CVE-2026-56681— 9Router: Authentication Bypass in Public LLM API via Spoofable X-9r-Real-Ip Header
Quick assessment
Affected
decolua 9router
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
9Router is an AI router & token saver. Prior to 0.5.6, 9Router deployments that allow requests to reach Next.js without the sanitizing custom-server.js wrapper trust the client-supplied X-9r-Real-Ip header in src/dashboardGuard.js when isLocalRequest decides w
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I. Basic Information for CVE-2026-56681
Vulnerability Information
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Vulnerability Title
9Router: Authentication Bypass in Public LLM API via Spoofable X-9r-Real-Ip Header
Source: CVE Program / CVE List V5
Vulnerability Description
9Router is an AI router & token saver. Prior to 0.5.6, 9Router deployments that allow requests to reach Next.js without the sanitizing custom-server.js wrapper trust the client-supplied X-9r-Real-Ip header in src/dashboardGuard.js when isLocalRequest decides whether canAccessPublicLlmApi may skip API-key validation for /api/v1/* routes. A remote unauthenticated attacker can set X-9r-Real-Ip to 127.0.0.1 and be classified as a local client, including on the verified GET /api/v1/models route. This permits unauthorized use of the instance owner's configured LLM providers, consumption of paid credits, and enumeration of configured providers and models. This issue is fixed in version 0.5.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在安全决策中依赖未经信任的输入
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-56681
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-56681 (1)
Other References for CVE-2026-56681 (2)
IV. Related Vulnerabilities
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Same weakness: CWE-807
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V. Comments for CVE-2026-56681
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