GitLab Community Edition (CE) and Enterprise Edition (EE) before 8.17.8, 9.0.x before 9.0.13, 9.1.x before 9.1.10, 9.2.x before 9.2.10, 9.3.x before 9.3.10, and 9.4.x before 9.4.4 might allow remote attackers to execute arbitrary code via a crafted SSH URL in a project import.
https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg1466490.html
https://about.gitlab.com/2017/08/10/gitlab-9-dot-4-dot-4-released/