Jari,Three vulnerabilities (CVE-2016-2191, CVE-2016-3981, CVE-2016-3982) have been announced for optipng:
https://bugzilla.redhat.com/show_bug.cgi?id=1308550 https://bugzilla.redhat.com/show_bug.cgi?id=1327213 https://bugzilla.redhat.com/show_bug.cgi?id=1327215 Please update to 0.7.6 ASAP. -- Yaakov
