GitLab CE/EE versions 8.18 up to 11.x before 11.3.11, 11.4.x before 11.4.8, and 11.5.x before 11.5.1 have CRLF Injection in Project Mirroring when using the Git protocol.
https://about.gitlab.com/blog/categories/releases/
https://about.gitlab.com/2018/11/28/security-release-gitlab-11-dot-5-dot-1-released/
http://packetstormsecurity.com/files/160699/GitLab-11.4.7-Remote-Code-Execution.html
http://packetstormsecurity.com/files/160516/GitLab-11.4.7-Remote-Code-Execution.html