CVE-2026-21714 Denial of service in node

What is CVE-2026-21714?

CVE-2026-21714 is a medium-severity denial of service vulnerability in Nodejs Node.js, published on 30 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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: CWE-401

Which versions are affected by CVE-2026-21714?

2 open source packages ship an affected version, including node and node-min. It affects 1 product.

Products include Nodejs Node.js.

How do I fix CVE-2026-21714?

Upgrade node to a fixed version for your release line: 20.20.2, 22.22.2, 24.14.1 or 25.8.2.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-21714 being exploited?

There is no known exploitation of CVE-2026-21714 in the wild and no public exploit code.

Other vulnerabilities in Nodejs Node.js

• CVE-2023-32002 Security feature bypass in Node Critical 9.8
• CVE-2016-6303 Integer overflow in n/a Critical 9.8
• CVE-2017-15896 Security feature bypass in Node.js Critical 9.1
• CVE-2018-7160 Server-side request forgery in Node.js High 8.8
• CVE-2018-12120 Misconfiguration in Node.js High 8.1

All Nodejs Node.js vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-21714, AZL-81233, AZL-81251, BELL-CVE-2026-21714, BIT-node-2026-21714, BIT-node-min-2026-21714 and 13 more.