CVE-2026-21714
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Nodejs Node.js
PublishedMar 30, 2026
First seenMar 30, 2026
Weakness typeCWE-401CWE-401
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nodejs node.js | v ≤ 20.20.1, 22.0.0 ≤ v ≤ 22.22.1, 24.0.0 ≤ v ≤ 24.14.0, 25.0.0 ≤ v ≤ 25.8.1 | — |
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