CVE-2025-27219
First published: Mon Mar 03 2025(Updated: )
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. The method does not impose any limit on the length of the raw cookie value it processes. This oversight can lead to excessive resource consumption when parsing extremely large cookies.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| rubygems/cgi | >=0.4.0<0.4.2 | 0.4.2 |
| rubygems/cgi | =0.3.6 | 0.3.7 |
| rubygems/cgi | <0.3.5.1 | 0.3.5.1 |
| Ruby | <0.3.5.1 | |
| Ruby | >=0.4.0<0.4.2 | |
| Ruby | =0.3.6 | |
| <0.3.5.1 | ||
| >=0.4.0<0.4.2 | ||
| =0.3.6 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://hackerone.com/reports/2936778
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27219.yml
- https://github.com/ruby/cgi/pull/52
- https://github.com/ruby/cgi/pull/53
- https://github.com/ruby/cgi/pull/54
- https://www.cve.org/CVERecord?id=CVE-2025-27219
- https://nvd.nist.gov/vuln/detail/CVE-2025-27219
- https://github.com/advisories/GHSA-gh9q-2xrm-x6qv (Advisory)
Frequently Asked Questions
What is the severity of CVE-2025-27219?
CVE-2025-27219 has the potential to cause a Denial of Service (DoS) due to super-linear time complexity when parsing certain cookie strings.
How do I fix CVE-2025-27219?
To resolve CVE-2025-27219, upgrade the cgi gem to version 0.4.2 or later.
Which versions of the cgi gem are affected by CVE-2025-27219?
CVE-2025-27219 affects versions of the cgi gem from 0.4.0 to 0.4.2, as well as earlier versions up to 0.3.6.
What kind of attack does CVE-2025-27219 enable?
CVE-2025-27219 enables a Denial of Service attack by allowing maliciously crafted cookie strings to be processed inefficiently.
Are there any known patches for CVE-2025-27219?
Yes, the known patch for CVE-2025-27219 is included in version 0.4.2 of the cgi gem.
- agent/description
- agent/first-publish-date
- agent/type
- agent/weakness
- agent/author
- agent/references
- agent/source
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-gh9q-2xrm-x6qv
- alias/CVE-2025-27219
- agent/software-canonical-lookup
- agent/tags
- agent/severity
- collector/mitre-cve
- source/MITRE
- collector/nvd-cve
- source/NVD
- collector/nvd-api
- agent/last-modified-date
- agent/softwarecombine
- agent/event
- collector/epss-latest
- source/FIRST
- agent/epss
- collector/github-advisory
- package-manager/rubygems
- vendor/ruby-lang
- canonical/ruby
- version/ruby/0.4.0
- version/ruby/0.3.6