What happened:
Our hosting infrastructure runs on Ubuntu Linux, maintained by Canonical. Canonical released a security patch for nginx (the web server software that handles traffic to your book sites), version 1.24.0-2ubuntu7.16, addressing a legitimate vulnerability. As we do with all security patches from this trusted source, we applied it to our servers.
Shortly after, Canonical identified that this specific patch had an unintended side effect: it changed some internal software interfac...