Integer overflow bug in function minitiff_read_info() of optipng 0.7.6 allows an attacker to remotely execute code or cause denial of service.
https://www.debian.org/security/2017/dsa-4058
https://security.gentoo.org/glsa/201801-02
https://lists.debian.org/debian-lts-announce/2017/11/msg00030.html