CVE-2026-56681: high-severity vulnerability in decolua 9router
9Router: Authentication Bypass in Public LLM API via Spoofable X-9r-Real-Ip Header
Published · Updated
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36Vexday Risk Score
Patch soon. It has a working public exploit.
ssvc Attendcvss 7.3epss 1.1%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected products
decolua · 9routerRelated CVEs — decolua 9router
In the same product, most dangerous first.
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