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CVE-2026-73565— @hono/node-server: Unauthenticated memory-leak DoS via aborted WebSocket handshake

Quick assessment

Affected
honojs node-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

@hono/node-server 允许在 Node.js 环境中运行 Hono 应用程序。从版本 2.0.0 到 2.0.10，当向 upgradeWebSocket 路由发起 WebSocket 升级请求时，如果请求中缺少或存在格式错误的 Sec-WebSocket-Key 头部，src/websocket.ts 会将该请求的 IncomingMessage 对象保留在 waiterMap 中，并导致 waitForWebSocket 永远挂起，因为 ws.handleUpgrade 不会触发任何连接事件。由于

CVSS 5.3 · Medium EPSS 0.53% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs node-server >= 2.0.0, < 2.0.10 affected
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I. Basic Information for CVE-2026-73565

Vulnerability Information
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Vulnerability Title
@hono/node-server: Unauthenticated memory-leak DoS via aborted WebSocket handshake
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs node-server >= 2.0.0, < 2.0.10 -

II. Public POCs for CVE-2026-73565

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III. Intelligence Information for CVE-2026-73565

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Patches & Fixes for CVE-2026-73565 (2)

Vendor Advisories for CVE-2026-73565 (1)

IV. Related Vulnerabilities

Same product: node-server
Same vendor: honojs
Same weakness: CWE-401

V. Comments for CVE-2026-73565

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