Mitigates the following vulnerabilities:
- 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