ber-decoder.c in Libksba before 1.3.3 uses an incorrect integer data type, which allows remote attackers to cause a denial of service (crash) via crafted BER data, which leads to a buffer overflow.
https://security.gentoo.org/glsa/201604-04
http://www.ubuntu.com/usn/USN-2982-1
http://www.openwall.com/lists/oss-security/2016/04/29/8