[$] Emacs code completion can cause compromise

Emacs has had afew bugs related to accidentallypermitting the execution of untrusted code. Unfortunately, it seems as thoughanother bug of that sort has appeared - and may be harder to patch,because the problem comes from the way Emacs handles expansion of Lisp macros incode being analyzed. Thevulnerability is only practically exploitable in a non-default configuration, sonot every Emacs user has something to worry about. The Emacsdevelopers are reportedly working on a fix, but have not yet shared detailsabout it. In the meantime, every Emacs version since at least26.1 (released in May2018) through the current development version is vulnerable.