For GitLab before 13.0.12, 13.1.6, 13.2.3 a denial of service exists in the project import feature
https://hackerone.com/reports/687730
https://gitlab.com/gitlab-org/gitlab/-/issues/31564
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13281.json