CVE-2026-73565
Description
@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.
How to fix
- @hono/node-server2.0.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @hono/node-servernpm | 2.0.0 ≤ v < 2.0.10 | 2.0.10 |
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