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GHSA-gh9q-2xrm-x6qv

CGI has Denial of Service (DoS) potential in Cookie.parse

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-27219

Packages

EcosystemPackageAffectedFixed in
RubyGems cgi < 0.3.5.1 0.3.5.1
RubyGems cgi >= 0.3.6, < 0.3.7 0.3.7
RubyGems cgi >= 0.4.0, < 0.4.2 0.4.2

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.