Integer overflow in the vmnc decoder in the gstreamer allows remote attackers to cause a denial of service (crash) via large width and height values, which triggers a buffer overflow.
https://security.gentoo.org/glsa/201705-10
https://scarybeastsecurity.blogspot.de/2016/11/0day-poc-risky-design-decisions-in.html
https://bugzilla.gnome.org/show_bug.cgi?id=774533
http://www.securityfocus.com/bid/94421
http://www.openwall.com/lists/oss-security/2016/11/18/13
http://www.openwall.com/lists/oss-security/2016/11/18/12
http://rhn.redhat.com/errata/RHSA-2017-0021.html