{"id":"CVE-2026-73565","title":"@hono/node-server allows running the Hono application on Node.js","summary":"@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 th…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-401","CWE-770"],"vendor":"honojs","product":"node-server","affected":["node-server >= 2.0.0, < 2.0.10"],"published":"2026-08-13","updated":"2026-09-10","sourceUpdated":"2026-09-10T20:30:11.423","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73565","references":[{"url":"https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1","label":"security-advisories@github.com"},{"url":"https://github.com/honojs/node-server/releases/tag/v2.0.10","label":"security-advisories@github.com"},{"url":"https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-08-14T16:45:01.113756Z"},"ingestedAt":"2026-09-13T05:23:43.026Z","epss":0.00388,"epssPercentile":0.32813,"slug":"CVE-2026-73565","body":"## Overview\n\n@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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}