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5.3 Medium

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)…

Description

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 and versions

Product Affected versions Fixed in
Node 25.8.1 No fix stated
Node 24.14.0 No fix stated
Node 22.22.1 No fix stated
Node 20.20.1 No fix stated

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