In March 2016, Kibana released versions 4.4.2, 4.3.3, and 4.1.6, primarily to address security vulnerabilities related to the OpenSSL CacheBleed issue and fix memory leak problems when connecting to Elasticsearch over SSL. These releases included several bug fixes and improvements, such as enhancements to the plugin installer for .tgz file types, adjustments to handle HTML unsafe characters in field names, and updates to distro package metadata. Notable changes across versions included a node version upgrade to v4.3.2 and various user interface and functionality improvements, ensuring a more stable and secure experience for Kibana users.