Nokogiri is an HTML, XML, SAX, and Reader parser.
A command injection vulnerability in Nokogiri allows commands to be executed in a subprocess by Ruby’s Kernel.open method. Processes are vulnerable only if the undocumented method Nokogiri::CSS::Tokenizer#load_file is being passed untrusted user input.
A remote attacker could possibly execute arbitrary code with the privileges of the process.
Avoid calling the undocumented method Nokogiri::CSS::Tokenizer#load_file with untrusted user input.
All Nokogiri users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-ruby/nokogiri-1.10.4"