CVE-2025-27219.yml

---
gem: cgi
cve: 2025-27219
ghsa: gh9q-2xrm-x6qv
url: https://www.cve.org/CVERecord?id=CVE-2025-27219
title: CVE-2025-27219 - Denial of Service in CGI::Cookie.parse
date: 2025-02-26
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.
cvss_v3: 5.8
patched_versions:
  - "~> 0.3.5.1"
  - "~> 0.3.7"
  - ">= 0.4.2"
related:
  url:
    - https://www.cve.org/CVERecord?id=CVE-2025-27219
    - https://www.suse.com/security/cve/CVE-2025-27219.html
    - https://www.ruby-lang.org/en/news/2025/02/26/security-advisories