Format string vulnerability in the log_message_cb function in otr-plugin.c in the Off-the-Record Messaging (OTR) pidgin-otr plugin before 3.2.1 for Pidgin might allow remote attackers to execute arbitrary code via format string specifiers in data that generates a log message.
http://www.debian.org/security/2012/dsa-2476
http://security.gentoo.org/glsa/glsa-201207-05.xml
http://openwall.com/lists/oss-security/2012/05/16/2
http://lists.opensuse.org/opensuse-security-announce/2012-06/msg00003.html