CVE-2026-21714MediumCVSS 5.3

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.

Published
May 31, 2026
Last Modified
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🔗 CVE IDs covered (1)

CVE-2026-21714 →

🎯 Affected products2

  • azl3 nodejs 20.14.0-14 on Azure Linux 3.0
  • azl3 nodejs24 24.13.0-3 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 24.14.1-1 KBCBL-Mariner Releases (Security Update) — fixed build 20.14.0-15

🔗 References (2)