A vulnerability was discovered in GitLab starting with version 12.2 that allows an attacker to cause uncontrolled resource consumption with a specially crafted file.
https://hackerone.com/reports/1077021
https://gitlab.com/gitlab-org/gitlab/-/issues/300095
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39877.json