If you get Fatal: Not possible to fast-forward, aborting GIT pull error, follow the solutions mentioned in this post to resolve the issue.

A severe vulnerability has been patched in Git software source code to prevent remote code execution attacks being launched at users. The bug, which is industry-wide, was disclosed on Tuesday. Git ...

Another critical issue allows code execution during an archive operation, which is commonly performed by Git forges," the researchers said in their explanation of the incident.