Heap-based buffer overflow in Opera 6.05 through 7.10 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a filename with a long extension.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11894
https://euvd.enisa.europa.eu/vulnerability/EUVD-2003-1386
http://www.securityfocus.com/bid/7450
http://archives.neohapsis.com/archives/bugtraq/2003-04/0346.html