CVE-2025-27220

7.5 highEPSS 0.8%

High (7.5) in ruby-lang cgi. EPSS 0.8% chance of exploitation in the next 30 days. Fixed in cgi 0.3.5.1, 0.3.7, 0.4.2.

In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method.

Severity

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)
CWE: CWE-1333
Published: 2025-03-04
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-mhwm-jh88-3gjf	RubyGems	cgi	<0.3.5.1	0.3.5.1
GHSA-mhwm-jh88-3gjf	RubyGems	cgi	>=0.3.6 <0.3.7	0.3.7
GHSA-mhwm-jh88-3gjf	RubyGems	cgi	>=0.4.0 <0.4.2	0.4.2