Bug 2566601 (CVE-2026-120637)

Summary: CVE-2026-120637 perl-cgi: perl-cgi: Parameter injection via unrecognized HTTP request method
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 processing an unrecognized HTTP request method, such as OPTIONS, the module unintentionally falls back into its default offline debugging mode. A remote attacker can exploit this issue by submitting a request with an unhandled method to force the application to populate request parameters and path information from process command-line arguments, potentially resulting in parameter injection or unexpected application behavior.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2567299    
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Description OSIDB Bzimport 2026-11-03 23:51:54 UTC
CGI versions before 5.00 for Perl take request parameters from the process command line arguments for an unrecognised REQUEST_METHOD.

For a REQUEST_METHOD such as OPTIONS, CGI falls through to its offline debugging mode, which is on by default, and builds the parameters and path_info from the process's command line arguments.