Medium [CVE-2026-73565] @hono/node-server: @hono/node-server: Denial of Service via aborted WebSocket handshake
This medium-severity Red Hat Linux advisory covers CVE-2026-73565.
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Summary
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. An unauthenticated attacker can trigger a denial of service by sending malformed WebSocket upgrade requests, leading to unbounded memory growth.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-459.
Red Hat lists Migration Toolkit for Applications 8; Red Hat Ansible Automation Platform 2; Red Hat Developer Hub; Red Hat Hardened Images; Red Hat OpenShift Dev Spaces as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- To mitigate this issue, restrict network access to the affected Grafana instance to trusted clients only. This can be achieved by configuring firewall rules to limit incoming connections to the port Grafana listens on. If the service is reloaded or restarted, ensure firewall rules persist.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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