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Security Advisories

CVE-2026-21714

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-21714

Severity

5.3

Medium

CVSS V3

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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.

  • https://nvd.nist.gov/vuln/detail/CVE-2026-21714
  • https://github.com/advisories/GHSA-cfr8-f5q7-84wq
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21714.json
  • https://nodejs.org/en/blog/vulnerability/march-2026-security-releases

Affected packages

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