Security researcher miaubiz used the Address Sanitizer tool to discover a buffer overflow in Canvas when specific bad height and width values were given through HTML. This could lead to a potentially exploitable crash. Miaubiz also found a potentially exploitable crash when 2D and 3D content was mixed which was introduced during Firefox development and fixed before general release. External Reference: http://www.mozilla.org/security/announce/2013/mfsa2013-03.html Acknowledgements: Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges miaubiz as the original reporter. Statement: This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5 and 6