Bug 2515517 (CVE-2026-73565)

Summary:	CVE-2026-73565 @hono/node-server: @hono/node-server: Denial of Service via aborted WebSocket handshake
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abarbaro, alizardo, dschmidt, jchui, jhe, jlanda, jwong, kshier, ktsao, nboldt, oaljalju, omaciel, psrna, rjohnson, sdawley, simaishi, stcannon, teagle, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in @hono/node-server. An unauthenticated attacker can exploit this vulnerability by sending a WebSocket upgrade request with a missing or malformed Sec-WebSocket-Key header. This action causes the server to retain request data, leading to unbounded memory growth and eventually a Denial of Service (DoS), making the service unavailable.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-13 17:53:21 UTC

@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.