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CVE-2026-21714

Memory leak in Node.js HTTP/2 server via `WINDOW_UPDATE` on stream 0 leads to resource exhaustion

Severity
Medium 5.3
Published
24 Mar 2026
Last changed
19 Aug 2026
Added to UpHeron
21 Oct 2026
Fixed in
20.20.2, 22.22.2, 24.14.1, 25.8.2
Sources
NVD, nodejs

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.

Affected software

SoftwareAffected versions
Node.jsServers and applications · cpe:a:nodejs:node.js
  • From 25.0.0 before 25.8.2
  • From 25.0.0 up to 25.8.1
  • From 24.0.0 before 24.14.1
  • From 24.0.0 up to 24.14.0
All 8 release lines
  • Every version up to 20.20.1
  • From 20.0.0 before 20.20.2
  • From 22.0.0 up to 22.22.1
  • From 22.0.0 before 22.22.2
  • From 24.0.0 up to 24.14.0
  • From 24.0.0 before 24.14.1
  • From 25.0.0 up to 25.8.1
  • From 25.0.0 before 25.8.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-21714
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-21714
  • Node.js security release https://nodejs.org/en/blog/vulnerability/march-2026-security-releases