CVE-2026-21714: Medium severity OpenJS Foundation Node.js vulnerability
A memory leak occurs in Node.js HTTP/2 servers when a client sends WINDOWUPDATE frames on stream 0 (connection-level) that cause the flow control window to exceed the maximum value of 2³¹-1. The server correctly sends a GOAWAY frame, but the Http2Session object is never cleaned up.
This vulnerability affects HTTP2 users on Node.js 20, 22, 24 and 25.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-21714?
CVE-2026-21714 has been rated as a moderate severity vulnerability due to the potential for resource exhaustion.
How do I fix CVE-2026-21714?
To fix CVE-2026-21714, you should upgrade your Node.js version to the latest secure release.
Who is affected by CVE-2026-21714?
CVE-2026-21714 affects Node.js versions 20, 22, 24, and 25.
What type of vulnerability is CVE-2026-21714?
CVE-2026-21714 is a memory leak vulnerability in Node.js HTTP/2 servers.
What are the consequences of CVE-2026-21714?
The consequences of CVE-2026-21714 include potential performance degradation and denial of service due to unfreed memory.