WebSocket Vulnerability in Hono Node.js Server by Hono
CVE-2026-126343

5.3MEDIUM

Key Information:

Vendor

Honojs

Status
Node-server
Vendor
CVE Published:
12 November 2026

What is CVE-2026-126343?

A vulnerability exists in the Hono Node.js server which impacts the handling of WebSocket connections during asynchronous operations. Specifically, from versions 2.0.0 up to 2.1.6, the WebSocket upgrade process lacks proper error handling, allowing unauthenticated clients to disrupt connections unintentionally. An ECONNRESET error may occur if the TCP connection is reset before error listeners are attached, resulting in potential application crashes and heap growth if not properly managed. This poses a risk particularly to applications utilizing WebSocket support with async workflows. The issue has been remedied in version 2.1.6.

Affected Version(s)

node-server >= 2.0.0, < 2.1.6

References

https://github.com/honojs/node-server/security/advisories...
x_refsource_CONFIRM
https://github.com/honojs/node-server/commit/61cc0267e613...
x_refsource_MISC
https://github.com/honojs/node-server/releases/tag/v2.1.6
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.