Integer overflow in proto.c in libotr before 4.1.1 on 64-bit platforms allows remote attackers to cause a denial of service (memory corruption and application crash) or execute arbitrary code via a series of large OTR messages, which triggers a heap-based buffer overflow.
https://www.exploit-db.com/exploits/39550/
https://security.gentoo.org/glsa/201701-10
http://www.ubuntu.com/usn/USN-2926-1
http://www.securityfocus.com/bid/84285
http://www.securityfocus.com/archive/1/537745/100/0/threaded
http://www.debian.org/security/2016/dsa-3512
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00030.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00021.html