The KDE SSL Wrapper (KSSL) API in KDE SC 4.6.0 through 4.7.1, and possibly earlier versions, does not use a certain font when rendering certificate fields in a security dialog, which allows remote attackers to spoof the common name (CN) of a certificate via rich text.
https://bugzilla.redhat.com/show_bug.cgi?id=743054
http://www.redhat.com/support/errata/RHSA-2011-1385.html
http://www.redhat.com/support/errata/RHSA-2011-1364.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:162