The name_parse function in evdns.c in libevent before 2.1.6-beta allows remote attackers to have unspecified impact via vectors involving the label_len variable, which triggers an out-of-bounds stack read.
https://security.gentoo.org/glsa/201705-01
https://github.com/libevent/libevent/commit/96f64a022014a208105ead6c8a7066018449d86d
https://github.com/libevent/libevent/blob/release-2.1.6-beta/ChangeLog
https://access.redhat.com/errata/RHSA-2017:1201
https://access.redhat.com/errata/RHSA-2017:1106
https://access.redhat.com/errata/RHSA-2017:1104
http://www.securityfocus.com/bid/96014
http://www.openwall.com/lists/oss-security/2017/02/02/7