The decoupled download and installation steps in libzypp before 17.5.0 could lead to a corrupted RPM being left in the cache, where a later call would not display the corrupted RPM warning and allow installation, a problem caused by malicious warnings only displayed during download.
https://www.suse.com/de-de/security/cve/CVE-2018-7685/
https://bugzilla.suse.com/show_bug.cgi?id=1091624
http://lists.suse.com/pipermail/sle-security-updates/2018-August/004510.html