Node.js URL.format() Crash via Malformed IDN
CVE-2026-21712 Published on March 30, 2026
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.
Affected Versions
nodejs node:- Version 24.14.0, <= 24.14.0 is affected.
- Version 25.8.1, <= 25.8.1 is affected.
Exploit Probability
EPSS
0.01%
Percentile
2.77%
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.