The msn_slp_process_msg function in libpurple/protocols/msn/slpcall.c in the MSN protocol plugin in libpurple 2.6.0 and 2.6.1 as used in Pidgin before 2.6.2 allows remote attackers to cause a denial of service (application crash) via a handwritten (aka Ink) message related to an uninitialized variable and the incorrect \UTF16-LE\ charset name.