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.

Category

4.0
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.13%
Third-Party Advisory github.com
Affected: ruby-lang CGI
Published at:
Updated at:

References

Link Tags
https://hackerone.com/reports/2890322 permissions required
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27220.yml third party advisory

Frequently Asked Questions

What is the severity of CVE-2025-27220?
CVE-2025-27220 has been scored as a medium severity vulnerability.
How to fix CVE-2025-27220?
To fix CVE-2025-27220, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-27220 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-27220 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-27220?
CVE-2025-27220 affects ruby-lang CGI.
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