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 | |
| debian/ruby2.7 | <=2.7.4-1+deb11u1 | 2.7.4-1+deb11u5 |
| debian/ruby3.1 | <=3.1.2-7+deb12u1 | |
| debian/ruby3.3 | 3.3.8-1 |
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Reference Links
- https://github.com/ruby/cgi/pull/52
- https://github.com/ruby/cgi/pull/53
- https://github.com/ruby/cgi/pull/54
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27220.yml
- 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://hackerone.com/reports/2890322
- https://github.com/advisories/GHSA-mhwm-jh88-3gjf (Advisory)
- https://launchpad.net/bugs/cve/CVE-2025-27220
- https://github.com/ruby/cgi/commit/cd1eb08076c8b8e310d4d553d427763f2577a1b6
- https://security-tracker.debian.org/tracker/CVE-2025-27220
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-27220
- https://ubuntu.com/security/CVE-2025-27220
- https://access.redhat.com/errata/RHSA-2025:4063
- https://bugzilla.redhat.com/show_bug.cgi?id=2349696
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.
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