CVE-2026-73565: Honojs Node-Server

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

@hono/node-server allows running the Hono application on Node.js. From 2.0.0 until 2.0.10, a WebSocket upgrade request to an upgradeWebSocket route with a missing or malformed Sec-WebSocket-Key header causes src/websocket.ts to retain the request's IncomingMessage in waiterMap and leave waitForWebSocket pending because ws.handleUpgrade emits no connection event. The aborted handshake therefore has no cleanup path, allowing an unauthenticated attacker to flood a public route, cause unbounded memory growth, and eventually make the service unavailable. This issue is fixed in version 2.0.10.

Affected products

• Honojs Node-Server: from 2.0.0, before 2.0.10 (fixed in 2.0.10)

Published 2026-08-13. Last modified 2026-09-10.