The jQuery Validation Plugin (jquery-validation) provides drop-in validation for forms. Versions of jquery-validation prior to 1.19.5 are vulnerable to regular expression denial of service (ReDoS) when an attacker is able to supply arbitrary input to the url2 method. This is due to an incomplete fix for CVE-2021-43306. Users should upgrade to version 1.19.5 to receive a patch.

An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the jquery-validation npm package, when an attacker is able to supply arbitrary input to the url2 method

The GitHub Security Lab team has identified potential security vulnerabilities in jquery.validation.

The project contains one or more regular expressions that are vulnerable to ReDoS (Regular Expression Denial of Service)

This issue was discovered and reported by GitHub team member @erik-krogh (Erik Krogh Kristensen).