{"schema_version":"1.7.3","id":"GHSA-mhwm-jh88-3gjf","published":"2025-03-03T22:05:08Z","modified":"2026-02-04T03:25:56.576785Z","aliases":["CVE-2025-27220"],"related":["CGA-9mpc-wqhj-mv2j"],"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.\n\n## Details\n\nThe regular expression used in `CGI::Util#escapeElement` is vulnerable to ReDoS. The crafted input could lead to a high CPU consumption.\n\nThis 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.\n\n## Affected versions\n\ncgi gem versions <= 0.3.5, 0.3.6, 0.4.0 and 0.4.1.\n\n## Credits\n\nThanks to svalkanov for discovering this issue.\nAlso thanks to nobu for fixing this vulnerability.","affected":[{"package":{"name":"cgi","ecosystem":"RubyGems","purl":"pkg:gem/cgi"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.5.1"}]}],"versions":["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"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-mhwm-jh88-3gjf/GHSA-mhwm-jh88-3gjf.json"}},{"package":{"name":"cgi","ecosystem":"RubyGems","purl":"pkg:gem/cgi"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.3.6"},{"fixed":"0.3.7"}]}],"versions":["0.3.6"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-mhwm-jh88-3gjf/GHSA-mhwm-jh88-3gjf.json"}},{"package":{"name":"cgi","ecosystem":"RubyGems","purl":"pkg:gem/cgi"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.4.0"},{"fixed":"0.4.2"}]}],"versions":["0.4.0","0.4.1","0.4.2.beta1","0.4.2.beta2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-mhwm-jh88-3gjf/GHSA-mhwm-jh88-3gjf.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27220"},{"type":"WEB","url":"https://github.com/ruby/cgi/pull/52"},{"type":"WEB","url":"https://github.com/ruby/cgi/pull/53"},{"type":"WEB","url":"https://github.com/ruby/cgi/pull/54"},{"type":"WEB","url":"https://hackerone.com/reports/2890322"},{"type":"PACKAGE","url":"https://github.com/ruby/cgi"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27220.yml"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00008.html"},{"type":"WEB","url":"https://www.cve.org/CVERecord?id=CVE-2025-27220"},{"type":"WEB","url":"https://www.ruby-lang.org/en/news/2025/02/26/security-advisories"}],"database_specific":{"cwe_ids":["CWE-1333"],"github_reviewed":true,"github_reviewed_at":"2025-03-03T22:05:08Z","nvd_published_at":"2025-03-04T00:15:31Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L"},{"type":"CVSS_V4","score":"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"}]}