GHSA-gh9q-2xrm-x6qvMediumCVSS 5.8

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

Published
March 3, 2025
Last Modified
November 4, 2025

🔗 CVE IDs covered (1)

CVE-2025-27219 →

📋 Description

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.

🎯 Affected products3

  • rubygems/cgi:< 0.3.5.1
  • rubygems/cgi:= 0.3.6
  • rubygems/cgi:>= 0.4.0, < 0.4.2

🔗 References (9)