gtkimhtml.c in Pidgin before 2.6.6 allows remote attackers to cause a denial of service (CPU consumption and application hang) by sending many smileys in a (1) IM or (2) chat.
developer.pidgin.im/wiki/ChangeLog
lists.fedoraproject.org/pipermail/package-announce/2010-February/035332.html
lists.fedoraproject.org/pipermail/package-announce/2010-February/035347.html
lists.fedoraproject.org/pipermail/package-announce/2010-February/035409.html
lists.opensuse.org/opensuse-security-announce/2010-03/msg00004.html
pidgin.im/news/security/?id=45
secunia.com/advisories/38563
secunia.com/advisories/38640
secunia.com/advisories/38658
secunia.com/advisories/38712
secunia.com/advisories/38915
secunia.com/advisories/39509
www.debian.org/security/2010/dsa-2038
www.mandriva.com/security/advisories?name=MDVSA-2010:041
www.mandriva.com/security/advisories?name=MDVSA-2010:085
www.osvdb.org/62440
www.securityfocus.com/bid/38294
www.ubuntu.com/usn/USN-902-1
www.vupen.com/english/advisories/2010/0413
www.vupen.com/english/advisories/2010/0914
www.vupen.com/english/advisories/2010/1020
bugzilla.redhat.com/show_bug.cgi?id=565792
exchange.xforce.ibmcloud.com/vulnerabilities/56394
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17554
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9842
rhn.redhat.com/errata/RHSA-2010-0115.html