Istio 1.4.7 and 1.5.1 have been released. The release notes for Istio 1.4.7 are here: https://istio.io/news/releases/1.4.x/announcing-1.4.7/ and the release notes for 1.5.1 are here: https://istio.io/news/releases/1.5.x/announcing-1.5.1/. Please note that these releases contain fixes for two CVEs discussed here: https://istio.io/news/security/istio-security-2020-004/.