CVE-2026-62312: Decolua 9router

High severity, CVSS 8.8. EPSS: 1.3% chance of exploitation in the next 30 days.

9Router is an AI router & token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.

Affected products

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

Published 2026-07-15. Last modified 2026-07-16.