* CVE-2019-16255: A code injection vulnerability of Shell#[] and Shell#test
* CVE-2019-16254: HTTP response splitting in WEBrick (Additional fix)
* CVE-2019-15845: A NUL injection vulnerability of File.fnmatch and File.fnmatch?
* CVE-2019-16201: Regular Expression Denial of Service vulnerability of WEBrick.s Digest access authentication