CVE-2026-21714
Published: March 26, 2026Last modified: March 28, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.3 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | LOW |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | nodejs | Fixed (20.20.2-r0) |
| 25 LTS | nodejs | Fixed (22.22.2-r0) | |
| Stream | nodejs | Fixed (24.14.1-r0) | |
| Hardened Containers | 23 LTS | nodejs | Fixed (20.20.2-r0) |
| 25 LTS | nodejs | Fixed (22.22.2-r0) | |
| Stream | nodejs | Fixed (24.14.1-r0) |