An issue was discovered in GitLab Enterprise Edition 8.11.0 through 12.0.2. By using brute-force a user with access to a project, but not it's repository could create a list of merge requests template names. It has excessive algorithmic complexity.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-4584
https://about.gitlab.com/releases/2019/07/03/security-release-gitlab-12-dot-0-dot-3-released/