Bug 2566600 (CVE-2026-120636)

Summary: CVE-2026-120636 perl-cgi: perl-cgi: script injection via unvalidated request URI
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in perl-cgi. The component constructs target URLs and form actions from client-supplied request values without sufficient validation. A remote attacker can exploit this flaw by sending a specially crafted request URI (Uniform Resource Identifier) containing arbitrary domains or script schemes. This vulnerability may allow an attacker to execute arbitrary scripts in a victim's web browser or redirect users to malicious external websites.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2567300    
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Description OSIDB Bzimport 2026-11-03 23:51:50 UTC 
CGI versions before 5.00 for Perl allow open redirects and script injection via URLs built from REQUEST_URI in url and start_form.

url(-absolute=>1), url(-relative=>1) and the default start_form action are built from the client-supplied REQUEST_URI without validation. The result can be protocol-relative (//evil.example), absolute-form (http://evil.example/) or contain backslashes, and url(-relative=>1) can return a javascript: URL. Links and form posts built from these URLs can go to another host.