filter/urltolink/filter.php in Moodle through 2.5.9, 2.6.x before 2.6.9, 2.7.x before 2.7.6, and 2.8.x before 2.8.4 allows remote authenticated users to cause a denial of service (CPU consumption or partial outage) via a crafted string that is matched against an improper regular expression.
https://github.com/advisories/GHSA-36cm-vrqh-8p98
https://moodle.org/mod/forum/discuss.php?d=307382
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-2120
http://openwall.com/lists/oss-security/2015/03/16/1
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-38466