This release includes security fixes. Please check the topics below for details. CVE-2019-15845: A NUL injection vulnerability of File.fnmatch and File.fnmatch? A NUL injection vulnerability of Ruby built-in methods (File.fnmatch and File.fnmatch?) was found. An attacker who has the control of the path pattern parameter could exploit this vulnerability to make path matching pass despite the intention of the program author. CVE-2019-16201: Regular Expression Denial of Service vulnerability of WEBrick's Digest access authentication Regular expression denial of service vulnerability of WEBrick's Digest authentication module was found. An attacker can exploit this vulnerability to cause an effective denial of service against a WEBrick service. CVE-2019-16254: HTTP response splitting in WEBrick (Additional fix) There is an HTTP response splitting vulnerability in WEBrick bundled with Ruby. CVE-2019-16255: A code injection vulnerability of Shell# and Shell#test A code injection vulnerability of Shell# and Shell#test in a standard library (lib/shell.rb) was found.