| Name | CVE-2026-21714 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6183-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| nodejs (PTS) | bullseye | 12.22.12~dfsg-1~deb11u4 | vulnerable |
| bullseye (security) | 12.22.12~dfsg-1~deb11u7 | vulnerable | |
| bookworm, bookworm (security) | 18.20.4+dfsg-1~deb12u1 | vulnerable | |
| trixie | 20.19.2+dfsg-1 | vulnerable | |
| trixie (security) | 20.19.2+dfsg-1+deb13u2 | fixed | |
| forky, sid | 22.22.2+dfsg+~cs22.19.15-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| nodejs | source | trixie | 20.19.2+dfsg-1+deb13u2 | DSA-6183-1 | ||
| nodejs | source | (unstable) | 22.22.2+dfsg+~cs22.19.15-1 |
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
Fixed by: https://github.com/nodejs/node/commit/a0c73425da4c95fbcf6c13b7fe8921301290b8e6 (v20.20.2)