The net-snmp package in OpenBSD through 5.8 uses 0644 permissions for snmpd.conf, which allows local users to obtain sensitive community information by reading this file.
http://www.securitytracker.com/id/1034099
http://www.openwall.com/lists/oss-security/2015/11/09/6
http://packetstormsecurity.com/files/134323/OpenBSD-net-snmp-Information-Disclosure.html