GHSA-mhwm-jh88-3gjf

Suggest an improvement
Source
https://github.com/advisories/GHSA-mhwm-jh88-3gjf
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-mhwm-jh88-3gjf/GHSA-mhwm-jh88-3gjf.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-mhwm-jh88-3gjf
Aliases
Related
Published
2025-03-03T22:05:08Z
Modified
2025-03-04T16:59:33.219250Z
Severity
  • 4.0 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L CVSS Calculator
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
CGI has Regular Expression Denial of Service (ReDoS) potential in Util#escapeElement
Details

There is a possibility for Regular expression Denial of Service (ReDoS) by in the cgi gem. This vulnerability has been assigned the CVE identifier CVE-2025-27220. We recommend upgrading the cgi gem.

Details

The regular expression used in CGI::Util#escapeElement is vulnerable to ReDoS. The crafted input could lead to a high CPU consumption.

This vulnerability only affects Ruby 3.1 and 3.2. If you are using these versions, 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 svalkanov for discovering this issue. Also thanks to nobu for fixing this vulnerability.

Database specific 
{
    "nvd_published_at": "2025-03-04T00:15:31Z",
    "cwe_ids": [
        "CWE-1333"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2025-03-03T22:05:08Z"
}
References

Affected packages

RubyGems / cgi

Package

Name
cgi
Purl
pkg:gem/cgi

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.3.5.1

Affected versions

0.*

0.1.0
0.1.0.1
0.1.0.2
0.1.1
0.2.0
0.2.1
0.2.2
0.3.0
0.3.1
0.3.2
0.3.3
0.3.4
0.3.5

RubyGems / cgi

Package

Name
cgi
Purl
pkg:gem/cgi

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0.3.6
Fixed
0.3.7

Affected versions

0.*

0.3.6

RubyGems / cgi

Package

Name
cgi
Purl
pkg:gem/cgi

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0.4.0
Fixed
0.4.2

Affected versions

0.*

0.4.0
0.4.1
0.4.2.beta1
0.4.2.beta2