The silc_channel_message function in ops.c in the SILC protocol plugin in libpurple in Pidgin before 2.10.1 does not perform the expected UTF-8 validation on message data, which allows remote attackers to cause a denial of service (application crash) via a crafted message, a different vulnerability than CVE-2011-3594.
developer.pidgin.im/viewmtn/revision/diff/c7b95cc3be0590b52edc02d4750ae62844c1acb6/with/afb9ede3de989f217f03d5670cca00e628bd11f1/libpurple/protocols/silc/ops.c
developer.pidgin.im/viewmtn/revision/info/afb9ede3de989f217f03d5670cca00e628bd11f1
secunia.com/advisories/47234
www.pidgin.im/news/security/?id=59
www.redhat.com/support/errata/RHSA-2011-1820.html
www.securityfocus.com/bid/51074
hermes.opensuse.org/messages/13195955
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18303