A lack of length validation in GitLab CE/EE affecting all versions from 8.3 before 15.10.8, 15.11 before 15.11.7, and 16.0 before 16.0.2 allows an authenticated attacker to create a large Issue description via GraphQL which, when repeatedly requested, saturates CPU usage.
https://hackerone.com/reports/1869839
https://gitlab.com/gitlab-org/gitlab/-/issues/392433
https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0921.json