Connector/ODBC is now built with MySQL client library 8.0.18, which includes OpenSSL 1.1.1d. Issues fixed in the new OpenSSL version are described at http://www.openssl.org/news/vulnerabilities.html. (Bug #29868815)
On Linux, memory was leaked on each server connection attempt due to how mysql_server_end was implemented and executed. (Bug #26194929)
On Windows, fixed direct setlocale() usage for multi-threaded applications.
The workaround was to add ;NO_LOCALE=1 to the connection string.
Thanks to Jacques Germishuys for the patch. (Bug #24814467, Bug #83297)