server/parser/sprite_definition.cpp in GNU Gnash (aka GNU Flash Player) 0.7.2 allows remote attackers to execute arbitrary code via a large number of SHOWFRAME elements within a DEFINESPRITE element, which triggers memory corruption and enables the attacker to call free with an arbitrary address, probably resultant from a buffer overflow.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34148
http://www.vupen.com/english/advisories/2007/1688
http://www.securitytracker.com/id?1018041
http://www.securityfocus.com/bid/23765
http://www.novell.com/linux/security/advisories/2007_13_sr.html
http://secunia.com/advisories/25787