Ruby Improper Limitation of a Pathname to a Restricted Directory (Path Traversal) Vulnerability - CVE-2018-6914
Directory traversal vulnerability in the Dir.mktmpdir method in the tmpdir library in Ruby before 2.2.10 2.3.x before 2.3.7 2.4.x before 2.4.4 2.5.x before 2.5.1 and 2.6.0-preview1 might allow attackers to create arbitrary directories or files via a .. (dot dot) in the prefix argument.