GitHub Advisoryadvisory · RubyGems

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

MEDIUM Published 2025-03-03 Modified 2025-11-04 Official page ↗
Aliases
CVE-2025-27219
Ecosystem
RubyGems
Packages
cgi
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Weaknesses
CWE-400, CWE-770
Reviewed
2025-03-03

Affected packages

• RubyGems cgi: < 0.3.5.1 → fixed in 0.3.5.1 • RubyGems cgi: >= 0.3.6, < 0.3.7 → fixed in 0.3.7 • RubyGems cgi: >= 0.4.0, < 0.4.2 → fixed in 0.4.2

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.

Related

Alias · CVE (1)

  • CVE-2025-27219 In the CGI gem before 0.4.2 for Ruby, the CGI::Cookie.parse method in the CGI library contains a potential Denial of Service (DoS)… vulnerability

Weakness · CWE (2)

  • CWE-400 Uncontrolled Resource Consumption weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References