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GHSA-mhwm-jh88-3gjf

CGI has Regular Expression Denial of Service (ReDoS) potential in Util#escapeElement

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-27220

Packages

EcosystemPackageAffectedFixed in
RubyGems cgi < 0.3.5.1 0.3.5.1
RubyGems cgi >= 0.3.6, < 0.3.7 0.3.7
RubyGems cgi >= 0.4.0, < 0.4.2 0.4.2

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.