| Name | CVE-2025-27220 |
| Description | In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| ruby2.7 (PTS) | bullseye | 2.7.4-1+deb11u1 | vulnerable |
| bullseye (security) | 2.7.4-1+deb11u4 | vulnerable |
| ruby3.1 (PTS) | bookworm, bookworm (security) | 3.1.2-7+deb12u1 | vulnerable |
| sid | 3.1.2-8.5 | vulnerable |
| ruby3.3 (PTS) | sid, trixie | 3.3.7-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| ruby2.7 | source | (unstable) | (unfixed) | | | |
| ruby3.1 | source | (unstable) | (unfixed) | | | |
| ruby3.3 | source | (unstable) | (unfixed) | | | |
Notes
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27220.yml
https://github.com/ruby/cgi/commit/cd1eb08076c8b8e310d4d553d427763f2577a1b6 (v0.4.2)
https://github.com/ruby/cgi/pull/52