There is an unintentional directory creation vulnerability in tmpdir library bundled with Ruby on Windows. And there is also an unintentional file creation vulnerability in tempfile library bundled with Ruby on Windows, because it uses tmpdir internally.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-28966
• ruby/tmpdir#8
• ruby/tmpdir@93798c0
• https://hackerone.com/reports/1131465
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/tmpdir/CVE-2021-28966.yml
• https://rubygems.org/gems/tmpdir
• https://www.ruby-lang.org/en/news/2021/04/05/tempfile-path-traversal-on-windows-cve-2021-28966/
• https://security.netapp.com/advisory/ntap-20210902-0004/