CVE-2024-3651: Kjd Internationalized Domain Names In Applications

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

A vulnerability was identified in the kjd/idna library, specifically within the `idna.encode()` function, affecting version 3.6. The issue arises from the function's handling of crafted input strings, which can lead to quadratic complexity and consequently, a denial of service condition. This vulnerability is triggered by a crafted input that causes the `idna.encode()` function to process the input with considerable computational load, significantly increasing the processing time in a quadratic manner relative to the input size.

Affected products

• Kjd Internationalized Domain Names In Applications: from 0.2, before 3.7 (fixed in 3.7)

Published 2024-07-07. Last modified 2026-06-17.