The gaim_markup_strip_html function in Gaim 1.2.0, and possibly earlier versions, allows remote attackers to cause a denial of service (application crash) via a string that contains malformed HTML, which causes an out-of-bounds read.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11292
http://www.securityfocus.com/bid/12999
http://www.securityfocus.com/archive/1/426078/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2005-365.html
http://www.novell.com/linux/security/advisories/2005_36_sudo.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:071
http://secunia.com/advisories/14815