What is CVE-2026-21712?

CVE-2026-21712 is a medium-severity vulnerability in Nodejs Node, classified under Improper Input Validation. CVSS score: 5.7/10. Published 2026-03-30.

How severe is CVE-2026-21712?

Medium severity. CVSS v3 base score is 5.7 out of 10.

Improper input validation in Nodejs Node

CVE-2026-21712

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.000 (10.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H.

Affected products

Nodejs Node — versions 24.14.0, 25.8.1

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

support@hackerone.com
support@hackerone.com

Frequently asked questions

What is CVE-2026-21712?: CVE-2026-21712 is a medium-severity vulnerability in Nodejs Node, classified under Improper Input Validation. CVSS score: 5.7/10. Published 2026-03-30.
How severe is CVE-2026-21712?: Medium severity. CVSS v3 base score is 5.7 out of 10.