CVE-2026-21712

6.5 mediumEPSS 0.3%

Medium (6.5) in nodejs node.js. EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.5 medium

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 26% of CVEs (scores of 2026-10-31)
CWE: CWE-20
Published: 2026-03-30
Modified: 2026-08-19
Record from: the NVD, synced 2026-10-19

Affected

nodejs:node.js

References

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

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