Provide references for CVE-2021-43809.
Where can I find more information about CVE-2021-43809?
References are available at: https://github.com/rubygems/rubygems/security/advisories/GHSA-fj7f-vq84-fh43, https://github.com/rubygems/rubygems/pull/5142, https://github.com/rubygems/rubygems/commit/0fad1ccfe9dd7a3c5b82c1496df3c2b4842870d3, https://github.com/rubygems/rubygems/commit/a4f2f8ac17e6ce81c689527a8b6f14381060d95f, https://www.sonarsource.com/blog/securing-developer-tools-package-managers/.