Opera allows remote attackers to cause a denial of service (invalid memory reference and application crash) via a web page or HTML email that contains a TBODY tag with a large COL SPAN value, as demonstrated by mangleme.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17806
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-1609
http://www.securityfocus.com/bid/11441
http://marc.info/?l=bugtraq&m=109811406620511&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2004-October/027709.html