Medium severity · published Mar 30, 2026
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…
6.5
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
node · nodejs
24.14.0 through 24.14.0; 25.8.1 through 25.8.1 · source: vendor
NO
Node.js · Nodejs
24.0.0 through 24.14.0; 25.0.0 through 25.8.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21712
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21712
Issue Tracking
https://hackerone.com/reports/3546390
Vendor Advisory
https://nodejs.org/en/blog/vulnerability/march-2026-security-releases
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