openSUSE has issued an advisory on January 15: https://lists.opensuse.org/opensuse-updates/2018-01/msg00042.html The issue was fixed upstream in 1.7.87.
Assigning to the registered pngcrush maintainer.
Component: RPM Packages => SecurityQA Contact: (none) => securityAssignee: bugsquad => rverscheldeCC: (none) => marja11
Status comment: (none) => Fixed upstream in 1.7.87
Did didn't get fixed for Mga5, but 6 is OK
Resolution: (none) => OLDStatus: NEW => RESOLVED