The build package before 20171128 did not check directory names during extraction of build results that allowed untrusted builds to write outside of the target system,allowing escape out of buildroots.
https://lists.opensuse.org/opensuse-security-announce/2018-01/msg00030.html
https://lists.opensuse.org/opensuse-security-announce/2017-12/msg00025.html
https://lists.opensuse.org/opensuse-security-announce/2017-12/msg00024.html