---
cve: "CVE-2026-73565"
severity: "MEDIUM"
cvss: 5.3
epss: "39%"
vendor: "honojs"
kev: false
exploited: false
published: "2026-08-13 18:18:19"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T07:20:44+02:00"
---

# CVE-2026-73565

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

@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-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 3a21938c418340e980cb7ffa88e78369f78392d1 (Commit)
- 7c1457ed5536c02fdd2f001129fae67bcbca54a1 (Commit)

## Referenzen

- <https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg>
- <https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1>
- <https://github.com/honojs/node-server/releases/tag/v2.0.10>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73565) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_