* 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
Fixes the following vulnerabilities in rubygems:
CVE-2019-8320: Delete directory using symlink when decompressing tar
CVE-2019-8321: Escape sequence injection vulnerability in verbose
CVE-2019-8322: Escape sequence injection vulnerability in gem owner
CVE-2019-8323: Escape sequence injection vulnerability in API response handling
CVE-2019-8324: Installing a malicious gem may lead to arbitrary code execution
CVE-2019-8325: Escape sequence injection vulnerability in errors