VULNERABILITY INTELLIGENCE

CVE-2026-21714

CVSS score5.3 MEDIUM
EPSS probability0.43%
CISA KEVNot currently listed
Published2026-03-30
Last modified2026-08-19
CVSS vectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Weakness classification

  • CWE-401: Missing Release of Memory after Effective Lifetime

Primary references