GHSA-gh9q-2xrm-x6qv — CGI has Denial of Service (DoS) potential in Cookie.parse

Affected: RubyGems: cgi

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 for discovering this issue. Also thanks to mame for fixing this vulnerability.

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GHSA-gh9q-2xrm-x6qv — CGI has Denial of Service (DoS) potential in Cookie.parse