{"id":"GHSA-9mqv-5hh9-4cgg","title":"Node.js Adapter for Hono: Unauthenticated memory-leak DoS via aborted WebSocket handshake","summary":"Node.js Adapter for Hono: Unauthenticated memory-leak DoS via aborted WebSocket handshake","severity":"medium","cvss":5.3,"cwe":["CWE-401","CWE-770"],"vendor":"hono","product":"@hono/node-server","ecosystem":"npm","affected":["@hono/node-server >= 2.0.0, <= 2.0.9"],"patched":["@hono/node-server 2.0.10"],"published":"2026-07-21","updated":"2026-07-21","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-9mqv-5hh9-4cgg","references":[{"url":"https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg"},{"url":"https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1"},{"url":"https://github.com/honojs/node-server/releases/tag/v2.0.10"},{"url":"https://github.com/advisories/GHSA-9mqv-5hh9-4cgg"}],"tags":["ghsa","npm"],"ingestedAt":"2026-07-21T22:55:08.587Z","slug":"GHSA-9mqv-5hh9-4cgg","body":"## Overview\n\n## Summary\n\nA WebSocket upgrade request to an `upgradeWebSocket` route with a missing or malformed `Sec-WebSocket-Key` header leaks memory permanently. The request's `IncomingMessage` is retained in an internal map and a pending promise is never settled, even though no connection is established. Since the route is reachable pre-handshake without authentication, an unauthenticated attacker can flood it to gradually exhaust memory.\n\n## Details\n\nThe built-in WebSocket helper cleans up its internal map only on a successful handshake or when the route guard rejects the request. When `ws` aborts the handshake because `Sec-WebSocket-Key` is missing or malformed, no `connection` event is emitted, so neither cleanup path runs and the entry is retained forever. A present-but-malformed key leaks identically, so a proxy that only checks for the header's presence does not mitigate it.\n\n## Impact\n\nAn unauthenticated attacker can flood any public `upgradeWebSocket` route with malformed-key upgrade requests, causing unbounded memory growth and eventual loss of availability. No confidentiality or integrity impact.\n\nReported by @TarPeg007.\n\n## Affected packages\n\n- `@hono/node-server >= 2.0.0, <= 2.0.9`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `@hono/node-server 2.0.10`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}