Quassel before 0.12-rc1 uses an incorrect data-type size when splitting a message, which allows remote attackers to cause a denial of service (crash) via a long CTCP query containing only multibyte characters.
lists.opensuse.org/opensuse-updates/2015-04/msg00018.html
www.openwall.com/lists/oss-security/2015/03/20/12
www.openwall.com/lists/oss-security/2015/03/27/11
www.openwall.com/lists/oss-security/2015/03/28/3
www.securityfocus.com/bid/73305
github.com/quassel/quassel/commit/b5e38970ffd55e2dd9f706ce75af9a8d7730b1b8