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Vulnerability record · CVE-2026-21712 · published 30 March 2026

CVE-2026-21712: Nodejs node.js improper input validation vulnerability

Nodejs · Node.Js

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.

6.5 CVSS 3.1 Medium EPSS 0.32% · top 77.6% CWE-20 · Improper input validation
6.5CVSS 3.1 base score
0.32%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
19 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://hackerone.com/reports/3546390 Issue TrackingThird Party Advisory
https://nodejs.org/en/blog/vulnerability/march-2026-security-releases Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-21712), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.