CVE-2026-73565: CWE-401: Missing Release of Memory after Effective Lifetime in honojs node-server
A memory leak vulnerability exists in honojs node-server versions before 2.0.10. When a WebSocket upgrade request with a missing or malformed Sec-WebSocket-Key header is sent to an upgradeWebSocket route, the request's IncomingMessage is retained indefinitely, causing unbounded memory growth. This can lead to denial of service by exhausting server memory. The issue is fixed in version 2.0.10.
AI Analysis
Technical Summary
@hono/node-server versions >=2.0.0 and <2.0.10 have a memory management flaw in the WebSocket upgrade handling code. Specifically, if a WebSocket upgrade request lacks a valid Sec-WebSocket-Key header, the IncomingMessage object is stored in waiterMap without cleanup because ws.handleUpgrade does not emit a connection event. This leaves the waitForWebSocket promise pending and the memory allocated for the request unreleased, enabling an unauthenticated attacker to cause unbounded memory growth and potential service unavailability. The vulnerability is addressed in version 2.0.10.
Potential Impact
An unauthenticated attacker can send malformed WebSocket upgrade requests to a public route, causing the server to retain memory indefinitely. This leads to unbounded memory growth and can result in denial of service due to resource exhaustion. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade honojs node-server to version 2.0.10 or later, where this memory leak issue has been fixed. No other mitigations are indicated by the vendor advisory.
CVE-2026-73565: CWE-401: Missing Release of Memory after Effective Lifetime in honojs node-server
Description
A memory leak vulnerability exists in honojs node-server versions before 2.0.10. When a WebSocket upgrade request with a missing or malformed Sec-WebSocket-Key header is sent to an upgradeWebSocket route, the request's IncomingMessage is retained indefinitely, causing unbounded memory growth. This can lead to denial of service by exhausting server memory. The issue is fixed in version 2.0.10.
CVSS v3.1
Score 5.3medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
@hono/node-server versions >=2.0.0 and <2.0.10 have a memory management flaw in the WebSocket upgrade handling code. Specifically, if a WebSocket upgrade request lacks a valid Sec-WebSocket-Key header, the IncomingMessage object is stored in waiterMap without cleanup because ws.handleUpgrade does not emit a connection event. This leaves the waitForWebSocket promise pending and the memory allocated for the request unreleased, enabling an unauthenticated attacker to cause unbounded memory growth and potential service unavailability. The vulnerability is addressed in version 2.0.10.
Potential Impact
An unauthenticated attacker can send malformed WebSocket upgrade requests to a public route, causing the server to retain memory indefinitely. This leads to unbounded memory growth and can result in denial of service due to resource exhaustion. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade honojs node-server to version 2.0.10 or later, where this memory leak issue has been fixed. No other mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-12T20:53:46.381Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7e058ebf8831d5399500f2
Added to database: 08/13/2026, 17:57:34 UTC
Last enriched: 08/13/2026, 18:12:11 UTC
Last updated: 08/13/2026, 19:08:20 UTC
Views: 4
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