CVE-2026-55641: Decolua 9router

High severity, CVSS 8.2. EPSS: 0.3% chance of exploitation in the next 30 days.

9Router is an AI router & token saver. Prior to 0.5.2, 9router determines whether a /v1 LLM proxy request is local by reading the client-controlled Host header, allowing a remote unauthenticated attacker to send Host: localhost and bypass API-key authentication. In the default configuration, this exposes the /v1 proxy to upstream provider calls using stored provider credentials and allows /v1/search with the searxng provider_options.baseUrl parameter to drive server-side requests to internal or cloud-metadata hosts. This issue is fixed in version 0.5.2.

Affected products

• Decolua 9router: before 0.5.2 (fixed in 0.5.2)

Published 2026-07-10. Last modified 2026-07-10.