People running the open-source Git code-repository software and tools based on it, like GitHub, on Mac OS X and Windows computers could have a significant security issue on their hands.

It’s possible for code to be executed remotely on such computers, according to a disclosure on the Linux kernel mailing list.

“We strongly encourage all users of GitHub and GitHub Enterprise to update their Git clients as soon as possible, and to be particularly careful when cloning or accessing Git repositories hosted on unsafe or untrusted hosts,” GitHub’s Vicent Marti wrote in a blog post on the issue.

Microsoft has issued patches for multiple versions of its Visual Studio software for developers.

Git and GitHub are widely used to collaborate on open-source projects and for proprietary software that companies build and maintain.