http://packetstormsecurity.com/files/152561/Slackware-Security-Advisory-libpng-Updates.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
https://github.com/fouzhe/security/tree/master/libpng
https://github.com/glennrp/libpng/issues/238
https://seclists.org/bugtraq/2019/Apr/30
https://security.gentoo.org/glsa/201908-02
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