The OSCAR protocol implementation in Pidgin before 2.5.8 misinterprets the ICQWebMessage message type as the ICQSMS message type, which allows remote attackers to cause a denial of service (application crash) via a crafted ICQ web message that triggers allocation of a large amount of memory.
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00228.html
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00176.html
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00162.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10004
https://exchange.xforce.ibmcloud.com/vulnerabilities/51448
https://bugzilla.redhat.com/show_bug.cgi?id=508738
http://www.vupen.com/english/advisories/2009/1749
http://www.ubuntu.com/usn/USN-796-1
http://www.securityfocus.com/bid/35530
http://www.redhat.com/support/errata/RHSA-2009-1139.html
http://secunia.com/advisories/37071
http://secunia.com/advisories/35706
http://secunia.com/advisories/35697
http://secunia.com/advisories/35693