Bug 2566598 (CVE-2026-120641)

Summary: CVE-2026-120641 perl-cgi: perl-cgi: arbitrary file write via unsanitized upload filenames
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
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 module returns client-supplied upload filenames without sanitizing directory traversal sequences or path separators. A remote attacker can exploit this flaw by submitting a file upload with a crafted filename, potentially causing the host application to write files outside the intended destination directory.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2567317    
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Description OSIDB Bzimport 2026-11-03 23:51:44 UTC 
CGI versions before 5.00 for Perl return upload filenames with any client-supplied path, including ../ and Windows paths.

The name returned for an uploaded file is the filename parameter of the part's Content-Disposition header, unchanged.

An application that saves the upload under this name can be made to write outside the intended directory.