Emacs 25.3 released

> This is an emergency release to fix a security vulnerability in Emacs.

> Enriched Text mode has its support for decoding 'x-display' disabled. This feature allows saving 'display' properties as part of text. Emacs 'display' properties support evaluation of arbitrary Lisp forms as part of instantiating the property, so decoding 'x-display' is vulnerable to executing arbitrary malicious Lisp code included in the text (e.g., sent as part of an email message).

> This vulnerability was introduced in Emacs 19.29. To work around that in Emacs versions before 25.3, append the following to your ~/.emacs init file:

  (eval-after-load "enriched"
    '(defun enriched-decode-display-prop (start end &optional param)
       (list start end)))

> Gnus no longer supports "richtext" and "enriched" inline MIME objects. This support was disabled to avoid evaluation of arbitrary Lisp code contained in email messages and news articles.