CVE-2026-21712

State: Published
Severity: 5.7 Medium
Published: Mar 30, 2026
Updated: May 10, 2026
Reserved: Jan 4, 2026

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.

Scores

CVSS	Score	Vector	Source
3.0	5.7 Medium	CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H	hackerone

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
nodenodejs	24.14.0 through 24.14.0Affected 25.8.1 through 25.8.1Affected

References

https://nodejs.org/en/blog/vulnerability/march-2026-security-releases
https://hackerone.com/reports/3546390

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