CGI has Regular Expression Denial of Service (ReDoS) potential in Util#escapeElement
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.
beschreibt (1)
Zugehörige CVEs.
| ID | Schweregrad | ausnutzbar | ||
|---|---|---|---|---|
| CVE-2025-27220US | high7.5 | — | ||
In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method. | ||||
Referenzen
Externe Belege — Patches, Meldungen, Analysen.
- https://github.com/ruby/cgiPACKAGE
- https://github.com/ruby/cgi/pull/52WEB
- https://github.com/ruby/cgi/pull/53WEB
- https://github.com/ruby/cgi/pull/54WEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27220.ymlWEB
- https://hackerone.com/reports/2890322WEB
- https://lists.debian.org/debian-lts-announce/2025/03/msg00008.htmlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-27220ADVISORY
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