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Vulnerability · Published Jul 10, 2026 · Assigned by GitHub_M

CVE-2026-566759router: Reverse proxy locality collapse allows unauthenticated access to 9router /v1 APIs

High 8.3

In plain English

A high-severity improper authentication in 9router from decolua. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.3High
Exploit odds (30 days)0.5%top 56.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

9Router is an AI router & token saver. Prior to 0.5.2, 9router treats loopback requests as trusted and allows /v1/* access without an API key, so a same-host reverse proxy that forwards public traffic to the backend through 127.0.0.1 causes src/dashboardGuard.js to misclassify external requests as local. A remote unauthenticated attacker can access /v1 APIs such as /v1/models and may abuse configured upstream provider credentials through /v1 proxy endpoints depending on enabled providers. This issue is fixed in version 0.5.2.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm9router0.5.2GHSA-x5c9-v98j-722r

Affected products (as reported)

VendorProductVersions
decolua 9router < 0.5.2

Weakness: CWE-287, CWE-290, CWE-306, CWE-441 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

References