CVE-2025-27220
First published: Mon Mar 03 2025(Updated: )
In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method.
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 |
| All of | ||
| Any of | ||
| Ruby | <0.3.5.1 | |
| Ruby | >=0.4.0<0.4.2 | |
| Ruby | =0.3.6 | |
| Any of | ||
| Ruby | =3.1.0 | |
| Ruby | =3.2.0 | |
| All of | ||
| Any of | ||
| <0.3.5.1 | ||
| >=0.4.0<0.4.2 | ||
| =0.3.6 | ||
| Any of | ||
| =3.1.0 | ||
| =3.2.0 |
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/2890322
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27220.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-2025-27220
- https://www.ruby-lang.org/en/news/2025/02/26/security-advisories
- https://nvd.nist.gov/vuln/detail/CVE-2025-27220
- https://github.com/advisories/GHSA-mhwm-jh88-3gjf (Advisory)
Frequently Asked Questions
What is the risk associated with CVE-2025-27220?
CVE-2025-27220 is associated with a Regular expression Denial of Service (ReDoS) vulnerability in the cgi gem.
How do I fix CVE-2025-27220?
To resolve CVE-2025-27220, upgrade the cgi gem to version 0.4.2 or later.
Which versions of the cgi gem are affected by CVE-2025-27220?
CVE-2025-27220 affects cgi gem versions below 0.4.2 and specifically versions 0.4.0 to 0.4.1, and 0.3.6.
Why is CVE-2025-27220 considered a Denial of Service vulnerability?
CVE-2025-27220 is classified as a Denial of Service vulnerability because an attacker can exploit the regex patterns to cause excessive resource consumption.
Where can I find more information about CVE-2025-27220?
More details about CVE-2025-27220 can typically be found in security advisories from the project maintainers or trusted vulnerability databases.
- agent/weakness
- agent/type
- agent/description
- agent/first-publish-date
- agent/author
- agent/references
- agent/source
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-mhwm-jh88-3gjf
- alias/CVE-2025-27220
- agent/software-canonical-lookup
- agent/severity
- agent/tags
- 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
- version/ruby/3.1.0
- version/ruby/3.2.0