This is the best summary I could come up with:

The issue was discovered by Google’s Threat Analysis Group (TAG), which discussed the problem in depth in a blog post.

The issue allows an attacker to execute arbitrary code when someone opens a zipped file.

"Cybercrime groups began exploiting the vulnerability in early 2023, when the bug was still unknown to defenders.

“TAG has observed government-backed actors from a number of countries exploiting the WinRAR vulnerability as part of their operations.”

While WinRAR is a useful piece of software used by over half a billion people, it is perhaps more famous as a meme or as the butt of jokes.

When Microsoft announced native support for the .rar file format, WinRAR shared a meme on Twitter (now called X).

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