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CVE-2026-73565

@hono/node-server: Unauthenticated memory-leak DoS via aborted WebSocket handshake

Published: Aug 13, 2026Updated: Aug 14, 2026 Sources: CVE List NVDCWE-401
5.3MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 68.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-401CWE-770

Affected Products

honojs
oss-projectaka hono
node-serverLibrary
OSS Libraries / web-framework

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

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

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