Bug 2566611 (CVE-2026-120648)

Summary: CVE-2026-120648 perl-CGI: perl-CGI: HTML injection via unescaped comment delimiter
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. When generating HTML comments, input is placed directly into comment tags without proper escaping. A remote attacker could exploit this flaw by submitting input that prematurely terminates the comment block, enabling the injection of arbitrary HTML or client-side scripts into the rendered web page.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2567289    
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Description OSIDB Bzimport 2026-11-03 23:52:29 UTC 
CGI versions before 5.00 for Perl allow HTML injection via text containing --> in comment.

Arguments are placed between <!-- and --> without escaping, so text containing --> closes the comment early.

An application that passes request data to comment can be made to inject HTML into the page.