In Git before 2.13.7, 2.14.x before 2.14.4, 2.15.x before 2.15.2, 2.16.x before 2.16.4, and 2.17.x before 2.17.1, remote code execution can occur. With a crafted .gitmodules file, a malicious project can execute an arbitrary script on a machine that runs “git clone --recurse-submodules” because submodule “names” are obtained from this file, and then appended to $GIT_DIR/modules, leading to directory traversal with “…/” in a name. Finally, post-checkout hooks from a submodule are executed, bypassing the intended design in which hooks are not obtained from a remote server.
Don't create OCP source-to-image applications from source code repositories hosted by untrusted parties. Github is blocking users from pushing repositories with malicious submodules so it's less likely you can pull a malicious repository from there which triggers this vulnerability.