Use-after-free vulnerability in bitlbee-libpurple before 3.5 allows remote servers to cause a denial of service (crash) or possibly execute arbitrary code by causing a file transfer connection to expire.
https://bugs.bitlbee.org/ticket/1281
http://www.securityfocus.com/bid/95935
http://www.openwall.com/lists/oss-security/2017/01/31/11