Ruby versions 2.3.8, 2.4.5, and 2.5.2 are now available
Change effective on 17 October 2018
Ruby versions 2.3.8, 2.4.5, and 2.5.2 are security releases made due to these vulnerabilities:
- CVE-2018-16396: Tainted flags are not propagated in 
Array#packandString#unpackwith some directives - CVE-2018-16395: 
OpenSSL::X509::Nameequality check does not work correctly 
To ensure that your application is not impacted by any of these vulnerabilities please upgrade your app to the latest version in the series. You can see the latest versions on the Ruby support page.