Stack-based buffer overflow in the Locale class in common/locid.cpp in International Components for Unicode (ICU) through 57.1 for C/C++ allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a long locale string.
https://www.tenable.com/security/tns-2016-19
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://security.gentoo.org/glsa/201701-58