honojs node-server up to 2.0.9 WebSocket Upgrade src/websocket.ts ws.handleUpgrade Sec-WebSocket-Key allocation of resources

Summaryinfo

A vulnerability described as problematic has been identified in honojs node-server up to 2.0.9. Affected by this vulnerability is the function ws.handleUpgrade of the file src/websocket.ts of the component WebSocket Upgrade. The manipulation of the argument Sec-WebSocket-Key results in allocation of resources. This vulnerability is known as CVE-2026-73565. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in honojs node-server up to 2.0.9. Affected is the function ws.handleUpgrade of the file src/websocket.ts of the component WebSocket Upgrade. The manipulation of the argument Sec-WebSocket-Key with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

@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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-73565 since 08/12/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 2.0.10 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• honojs

Name

• node-server

Version

• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5
• 2.0.6
• 2.0.7
• 2.0.8
• 2.0.9

Website

• Product: https://github.com/honojs/node-server/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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