CVE-2026-21714

ADVISORY - nist

Summary

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.

EPSS Score⁠: 0.00454 (0.364)

Common Weakness Enumeration (CWE)

ADVISORY - nist

CWE-401⁠

Missing Release of Memory after Effective Lifetime

ADVISORY - redhat

CWE-772⁠

Missing Release of Resource after Effective Lifetime

Impacted images

Advisories

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