medium5.3
CVE-2026-21714
A memory leak occurs in Node.js HTTP/2 servers when a client sends WINDOW_UPDATE frames on stream 0 (connection-level) that cause the flow control window to ex…
Impact
A memory leak occurs in Node.js HTTP/2 servers when a client sends WINDOW_UPDATE 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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Nodejs | Node.Js | through 20.20.1 from 22.0.0 through 22.22.1 from 24.0.0 through 24.14.0 from 25.0.0 through 25.8.1 |