CVE-2026-21714 — MEDIUM (5.3)

Vulnerability 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 Score

5.3

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

LOW

Related Weaknesses (CWE)

CWE-401

References

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

FAQ

What is CVE-2026-21714?

CVE-2026-21714 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 serv...

How severe is CVE-2026-21714?

CVE-2026-21714 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-21714?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.