For a summary of changes in Emacs 30, see the etc/NEWS file in the
tarball; you can view it from Emacs by typing 'C-h n', or by clicking
Help->Emacs News from the menu bar.
Emacs 30.1 includes security fixes for a shell injection vulnerability in man.el (CVE-2025-1244), and for arbitrary code execution with flymake (CVE-2024-53920). We recommend upgrading immediately.