An issue has been discovered in GitLab CE/EE affecting all versions starting from 15.7 prior to 16.9.7, starting from 16.10 prior to 16.10.5, and starting from 16.11 prior to 16.11.2. It was possible for an attacker to cause a denial of service by crafting unusual search terms for branch names.
https://hackerone.com/reports/2416356
https://gitlab.com/gitlab-org/gitlab/-/issues/451918
https://about.gitlab.com/releases/2024/05/08/patch-release-gitlab-16-11-2-released/