{"id":"CVE-2026-73565","aliases":["GHSA-9mqv-5hh9-4cgg"],"url":"https://o3.security/vulnerability/CVE-2026-73565","summary":"@hono/node-server: Unauthenticated memory-leak DoS via aborted WebSocket handshake","details":"@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.","published":"2026-08-13T17:37:28.579Z","modified":"2026-08-16T03:31:23.023843622Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"@hono/node-server","fixedVersion":"2.0.10"}],"fix":{"url":"https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1","label":"honojs/node-server@3a21938"},"references":[{"type":"WEB","url":"https://github.com/honojs/node-server/releases/tag/v2.0.10"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73565.json"},{"type":"ADVISORY","url":"https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73565"},{"type":"FIX","url":"https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-16T03:31:23.023843622Z"}}