CVE-2026-21714

MEDIUM5.3

A memory leak occurs in Node

Published Mar 30, 2026

Modified 2 weeks ago

Details

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 Packages

Node.js

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1809) / Server 2019Windows 10 (1903)Windows 10 (1909)

References

WEB

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

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-21714

CVSS Analysis

CVSS v3.0

5.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

UnchangedS:U

Impact

Confidentiality

NoneC:N

Integrity

NoneI:N

Availability

LowA:L

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

Ecosystems(18)

Windows 10 (1507)Windows 10 (1607) / Server 2016 Windows 10 (1809) / Server 2019 Windows 10 (1903)Windows 10 (1909)

Timeline

PublishedMar 30, 2026

ModifiedMar 31, 2026

CVE-2026-21714 | Mondoo Vulnerability Intelligence