CVE-2024-3651
Denial of Service via Quadratic Complexity in kjd/idna
- State
- Published
- Severity
- 6.2 Medium
- Published
- Jul 7, 2024
- Updated
- Nov 4, 2025
- Reserved
- Apr 10, 2024
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.0 | 6.2 Medium | CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | @huntr_ai |
Weaknesses
- CWE-1333 Inefficient Regular Expression Complexity
Affected Products
| Product | Versions |
|---|---|
kjd/idnakjd |
|
References
- https://huntr.com/bounties/93d78d07-d791-4b39-a845-cbfabc44aadb
- https://github.com/kjd/idna/commit/1d365e17e10d72d0b7876316fc7b9ca0eebdd38d
- https://lists.debian.org/debian-lts-announce/2024/05/msg00006.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/F2S5E23N6E52S46KGNYTDFB75LOC4N4D/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/S5IDLLD2IKSIVRBSLB34WTSYGLMWUFWF/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ULSC7HBJKXB3BZV367WM5BR6DFEC4Z43/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4YQUPYH3SVZ5GFF2CDQ55FCM575AZTF2/
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