Ruby: Security advisories: CVE-2025-27219, CVE-2025-27220 and CVE-2025-27221

[NewsBot]

A new Ruby blog post/announcement has been posted!

We published security advisories for CVE-2025-27219, CVE-2025-27220 and CVE-2025-27221. Please read the details below.

CVE-2025-27219: Denial of Service in CGI::Cookie.parse.

There is a possibility for DoS by in the cgi gem. This vulnerability has been assigned the CVE identifier CVE-2025-27219. We recommend upgrading the cgi gem.

Details

CGI::Cookie.parse took super-linear time to parse a cookie string in some cases. Feeding a maliciously crafted cookie string into the method could lead to a Denial of Service.

Please update CGI gem to version 0.3.5.1, 0.3.7, 0.4.2 or later.

Affected versions

• cgi gem versions <= 0.3.5, 0.3.6, 0.4.0 and 0.4.1.

Credits

Thanks to lio346</a...

Get the full details here: https://www.ruby-lang.org/en/news/2025/02/26/security-advisories/