CGI has Denial of Service (DoS) potential in Cookie.parse
Summary
CGI has Denial of Service (DoS) potential in Cookie.parse
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2025-27219 ruby Fixed in: 3.2.8-r0
- Debian DEBIAN-CVE-2025-27219 ruby2.7 Fixed in: 2.7.4-1+deb11u5
- Ubuntu UBUNTU-CVE-2025-27219 jruby
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web hackerone.com
- web github.com
- web lists.debian.org
- web cve.org