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We all know about the vulnerabilities in the X11 display server. And we also know that Apple used Xquartz in the past. So my question is

Is Xquarts still used on Macos Catalina? If no, then which display server is used currently.

I found this on Apple's website. It says X11 is not used. But is quite ambiguous whether it still uses Xquartz or not. And doesn't say anything about any new display server replacing Xquartz.

About X11 for Mac

X11 is no longer included with Mac, but X11 server and client libraries are available from the XQuartz project.

Apple created the XQuartz project as a community effort to further develop and support X11 on Mac. The XQuartz project was originally based on the version of X11 included in Mac OS X v10.5. There have since been multiple releases of XQuartz with fixes, support for new features, and additional refinements to the X11 experience. Apple is a contributor to the XQuartz project and has worked to ensure that X11 works as expected with macOS and latest available versions of XQuartz.

X11 server and client libraries for macOS are available from the XQuartz project at www.xquartz.org. Download the latest version available.

Abhay Patil
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You can use xQuartz for X11 apps - in Catalina and below. (I have no experience of Big Sur yet.) But regular Mac apps don't use X11 and never will.

(I know this because I use x3270 which is an X11 app.)

Martin Packer
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