Gentoo Linux Security Advisory 201801-7 - A vulnerability has been found in Emacs which may allow for arbitrary command execution. Versions less than 23.4-r16:23 are affected.
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Red Hat Security Advisory 2017-2771-01 - GNU Emacs is a powerful, customizable, self-documenting text editor. It provides special code editing features, a scripting language, and the capability to read e-mail and news. Security Fix: A command injection flaw within the Emacs "enriched mode" handling has been discovered. By tricking an unsuspecting user into opening a specially crafted file using Emacs, a remote attacker could exploit this flaw to execute arbitrary commands with the privileges of the Emacs user.
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Debian Linux Security Advisory 3975-1 - Charles A. Roelli discovered that Emacs is vulnerable to arbitrary code execution when rendering text/enriched MIME data (e.g. when using Emacs-based mail clients).
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