Double free in i18n/zonemeta.cpp in International Components for Unicode (ICU) for C/C++ through 59.1 allows remote attackers to execute arbitrary code via a crafted string, aka a "redundant UVector entry clean up function call" issue.
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
http://www.sourcebrella.com/blog/double-free-vulnerability-international-components-unicode-icu/
http://bugs.icu-project.org/trac/changeset/40324/trunk/icu4c/source/i18n/zonemeta.cpp