Recently I’ve experienced a GitLab security incident.
Had a pretty new GitLab version (~2 months old), but there were a few security patches released. Apparently, I was missing one of them.

I noticed GitLab throwing 500 errors randomly and later 502 consistently. Looking at the server I’ve noticed some processes run by “git” user, which shouldn't be running, consuming all CPU. Processes were restarting after killing them. Updating GitLab to the newest version resolved the issue.

Keeping software up-to-date can sometimes be a cumbersome process. But security incidents in sensitive systems can be very costly. Luckily, this time it wasn’t the case. I hope this reminder will save others from uncomfortable situations.