CVE-2026-21714

MediumCVSS 5.3/10Last modified Aug 19, 2026

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.

Metrics

CVSS 3.0 5.3/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-401

Affected software

No affected versions have been published.

Timeline

Published
Mar 30, 2026
Last modified
Aug 19, 2026
NVD status
Analyzed

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CVE-2026-21714: Medium severity, CVSS 5.3 | Vulnix