CVE-2025-27219 - Denial of Service in CGI::Cookie.parse
Published: February 26, 2025
SECURITY IDENTIFIERS
- CVE: CVE-2025-27219 (NVD)
- GHSA: GHSA-gh9q-2xrm-x6qv
GEM
SEVERITY
CVSS v3.x: 5.8 (Medium)
PATCHED VERSIONS
~> 0.3.5.1
~> 0.3.7
>= 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.