Resource exhaustion in Honojs Node-Server
CVE-2026-73565
@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 v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Honojs Node-server — versions >= 2.0.0, < 2.0.10
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-73565?
- CVE-2026-73565 is a medium-severity vulnerability in Honojs Node-Server, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.3/10. Published 2026-08-13.
- How severe is CVE-2026-73565?
- Medium severity. CVSS v3 base score is 5.3 out of 10.