A use-after-free vulnerability in SVG Animation has been discovered. An exploit built on this vulnerability has been discovered in the wild targeting Firefox and Tor Browser users on Windows. This vulnerability affects Firefox < 50.0.2, Firefox ESR < 45.5.1, and Thunderbird < 45.5.1.
https://www.mozilla.org/security/advisories/mfsa2016-92/
https://www.debian.org/security/2016/dsa-3730
https://security.gentoo.org/glsa/201701-35
https://security.gentoo.org/glsa/201701-15
http://www.securitytracker.com/id/1037370
http://www.securityfocus.com/bid/94591