CVE-2026-21714
Public on 2026-03-27
Modified on 2026-03-27
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.
NOTE: https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#memory-leak-in-nodejs-http2-server-via-window_update-on-stream-0-leads-to-resource-exhaustion-cve-2026-21714---medium
This vulnerability affects HTTP2 users on Node.js 20, 22, 24 and 25.
NOTE: https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#memory-leak-in-nodejs-http2-server-via-window_update-on-stream-0-leads-to-resource-exhaustion-cve-2026-21714---medium
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2023 | nodejs | Not Affected | ||
| Amazon Linux 2023 | nodejs20 | Pending Fix | ||
| Amazon Linux 2023 | nodejs22 | Pending Fix | ||
| Amazon Linux 2023 | nodejs24 | Pending Fix |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |