Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78
- https://github.com/honojs/node-server/releases/tag/v2.0.10
- https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg
FAQ
What is CVE-2026-73565?
CVE-2026-73565 is a vulnerability with a CVSS score of 5.3 (MEDIUM). @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...
How severe is CVE-2026-73565?
CVE-2026-73565 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-73565?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.