CVE-2026-21712 Denial of service in node

What is CVE-2026-21712?

CVE-2026-21712 is a medium-severity denial of service vulnerability in Nodejs Node.js, published on 30 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

A flaw in Node.js URL processing causes an assertion failure in native code when `url.format()` is called with a malformed internationalized domain name (IDN) containing invalid characters, crashing the Node.js process.

Weakness: CWE-20

Which versions are affected by CVE-2026-21712?

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-2026-21712?

Upgrade node to a fixed version for your release line: 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-2026-21712 being exploited?

There is no known exploitation of CVE-2026-21712 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-2026-21712, AZL-81101, BELL-CVE-2026-21712, BIT-node-2026-21712, BIT-node-min-2026-21712, GHSA-h8r7-m85c-mjhv and 3 more.