{"id":"CVE-2021-32821","aliases":["GHSA-v63q-hgqc-qvpg"],"url":"https://o3.security/vulnerability/CVE-2021-32821","summary":"MooTools Regular Expression Denial of Service","details":"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. No patches are available for this issue.","published":"2023-01-03T17:15:10.210Z","modified":"2026-07-08T22:13:55.176438Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"mootools","fixedVersion":null}],"fix":null,"references":[{"type":"EVIDENCE","url":"https://securitylab.github.com/advisories/GHSL-2020-345-redos-mootools/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T22:13:55.176438Z"}}