CVE-2026-120638 Details
Description
CGI versions before 5.00 for Perl allow open redirects via HTML entity decoding of the URL after application validation in redirect. redirect decodes HTML entities in its URL before writing the Location header, so a URL the application has already validated can change meaning. For example, //evil.example/ becomes //evil.example/ and sends the user to another host.
A vulnerability allowing open redirects has been identified in CGI.pm versions prior to 5.00 for Perl. The issue arises from the HTML entity decoding of URLs in the redirect() function, which occurs after application validation. This allows a previously validated URL to be manipulated, changing its destination. For instance, a URL like '//evil.example/' would be decoded to '//evil.example/', redirecting the user to an unintended host.
Users are advised to upgrade to CGI.pm version 5.00 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 4, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/leejo/CGI.pm/commit/7733c2753f4f240012097507cda2b6e87ae46db4.patch | CPANSec | Source CodeVendor |
| https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm | CPANSec | Source CodeVendor |
| https://metacpan.org/release/LEEJO/CGI-5.00/changes | CPANSec | AdvisoryBundleVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-180 | Incorrect Behavior Order: Validate Before Canonicalize | CPANSec |
| CWE-601 | URL Redirection to Untrusted Site ('Open Redirect') | CPANSec |
Affected Products
| Product | Versions |
|---|---|
| CGI | < 5.00 |
CPE
Remediation
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Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 4, 2026 | New CVE Received | CPANSec |