PHP: The three letters that shut down sites all over the internet today

Two bugs found with AI are behind major issues today for 4chan, DeviantArt, Wikipedia , and the blog where the bar around the corner posts pictures of people's dogs. The "critical vulnerabilities" were discovered in the PHP programming language, which underpins much of the internet, including any site built on WordPress. Some Dutch and Finnish government agencies took their sites down as a precaution.