CVE-2026-73565
@hono/node-server: Unauthenticated memory-leak DoS via aborted WebSocket handshake
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVDNVD · Awaiting Analysis | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.53% · top 55% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
Affected products
- affected >= 2.0.0, < 2.0.10
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npm@hono/node-serverGHSA-9mqv-5hh9-4cgg (opens in a new tab)
References (3)
- https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg (opens in a new tab)x_refsource_CONFIRM
- https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1 (opens in a new tab)x_refsource_MISC
- https://github.com/honojs/node-server/releases/tag/v2.0.10 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-9mqv-5hh9-4cgg (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-73565)Record last updated .