CVE-2026-21714CWE-401

CVE-2026-21714

Medium · published March 31, 2026

CVSS v3.0

5.3

EPSS

Percentile

38.4

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.0: 5.3 · MEDIUM
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0: Not supplied
EPSS: 0.00454 · 38.4th percentile
Weakness: CWE-401 · Missing Release of Memory after Effective Lifetime
Published: 2026-03-31T00:16Z

Affected products (4)

Product	Versions	Fixed in
nodejs/node.js	≤ 20.20.1	—
nodejs/node.js	≥ 22.0.0, ≤ 22.22.1	—
nodejs/node.js	≥ 24.0.0, ≤ 24.14.0	—
nodejs/node.js	≥ 25.0.0, ≤ 25.8.1	—

References (1)

https://nodejs.org/en/blog/vulnerability/march-2026-security-releases · [email protected]

EPSS history

Timeline

30 MAR 19:07Z
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…
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