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Vulnerability record · CVE-2026-21714 · published 30 March 2026

CVE-2026-21714: Nodejs node.js memory leak vulnerability

Nodejs · Node.Js

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.

5.3 CVSS 3.0 Medium EPSS 0.45% · top 63.1% CWE-401 · Memory leak
5.3CVSS 3.0 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
19 Aug 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://nodejs.org/en/blog/vulnerability/march-2026-security-releases Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-21714), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.