FreeType 2 before 2017-03-26 has an out-of-bounds write caused by a heap-based buffer overflow related to the t1_builder_close_contour function in psaux/psobjs.c.
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://www.oracle.com/security-alerts/cpuapr2020.html
https://security.gentoo.org/glsa/201706-14
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=941
http://www.securityfocus.com/bid/99091