Bug 2566609 (CVE-2026-120638) - CVE-2026-120638 perl-cgi: perl-cgi: Open redirect via HTML entity decoding in redirect function
Summary: CVE-2026-120638 perl-cgi: perl-cgi: Open redirect via HTML entity decoding in...
Keywords:
Status: NEW
Alias: CVE-2026-120638
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-03 23:52 UTC by OSIDB Bzimport
Modified: 2026-11-04 00:12 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-11-03 23:52:22 UTC 
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.
Note You need to log in before you can comment on or make changes to this bug.