CVE-2026-21714
published 2026-03-30CVE-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…
medium5.3CVSS 3.0
AVNACLPRNUINSUCNINAL
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
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | nodejs | < nodejs 22.22.2+dfsg+~cs22.19.15-1 (forky) | nodejs 22.22.2+dfsg+~cs22.19.15-1 (forky) |
| nodejs | node | 20.20.1 – 20.20.1 | — |
| nodejs | node | 22.22.1 – 22.22.1 | — |
| nodejs | node | 24.14.0 – 24.14.0 | — |
| nodejs | node | 25.8.1 – 25.8.1 | — |
| nodejs | nodejs | >= 0 < 22.22.2-r0 | 22.22.2-r0 |
| nodejs | nodejs | >= 0 < 22.22.2-r0 | 22.22.2-r0 |
| nodejs | nodejs | >= 0 < 24.14.1-r0 | 24.14.1-r0 |
| nodejs | nodejs | >= 0 < 20.19.2+dfsg-1+deb13u2 | 20.19.2+dfsg-1+deb13u2 |
| nodejs | nodejs | >= 0 < 22.22.2+dfsg+~cs22.19.15-1 | 22.22.2+dfsg+~cs22.19.15-1 |
CVSS provenance
nvdv3.05.3MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
osv5.3MEDIUM