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Node.js Assertion Failure in URL Processing via Malformed IDN Leads to Crash

Vulnerability

A vulnerability in Node.js URL handling has been identified, where the `url.format()` function crashes the Node.js process. This issue arises when the function is called with a malformed internationalized domain name (IDN) that contains invalid characters, leading to an assertion failure in the native code.

Impact

Exploiting this vulnerability causes the Node.js process to crash, creating a denial-of-service condition.

Remediation

Users can upgrade to Node.js versions 24.14.1 or 25.8.2, both of which include the necessary fix.

Added: Mar 30, 2026, 4:36 PM
Updated: Mar 30, 2026, 4:36 PM

Vulnerability Rating

Custom Algorithm
spread
7.8
impact
2.5
exploitability
3.3
remediation
7.7
relevance
4.9
threat
0.0
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.