MooTools Regular Expression Denial of Service

Description

MooTools is a collection of JavaScript utilities for JavaScript developers. All known versions include a CSS selector parser that is vulnerable to Regular Expression Denial of Service (ReDoS). An attack requires that an attacker can inject a string into a CSS selector at runtime, which is quite common with e.g. jQuery CSS selectors.

Recommendation

No fix is available yet. Followings are affected versions:

• <= 1.5.2

References

• GHSA-v63q-hgqc-qvpg
• CVE-2021-32821
• CWE-1333
• CWE-400
• CAPEC-310
• OWASP 2021-A6

Related Issues

• counterpart vulnerable to prototype pollution - CVE-2025-57354
• Parse Server has an OAuth login vulnerability - CVE-2025-30168
• Use of Insufficiently Random Values in undici - CVE-2025-22150
• SummerNote Cross Site Scripting Vulnerability - CVE-2024-37629

Tags:

npm

mootools