Bug 2567316

Summary: CVE-2026-120651 perl-CGI: perl-cgi: Denial of Service via truncated request body [fedora-all]
Product: [Fedora] Fedora Reporter: Marian Rehak <mrehak>
Component: perl-CGIAssignee: Jitka Plesnikova <jplesnik>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: jplesnik, mspacek, perl-devel
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["3657edba-ffc6-4bf4-abd6-bb3d0630f1f3"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2566599    

Description Marian Rehak 2026-11-05 14:29:07 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

CGI versions before 5.00 for Perl allow an infinite loop on a short request body when $DISABLE_UPLOADS is set.

When $CGI::PUTDATA_UPLOAD or an upload hook is set, read_postdata_putdata takes a request body that is not a form submission. With $CGI::DISABLE_UPLOADS set, it discards the body by reading until Content-Length bytes have arrived. Once a body shorter than its Content-Length runs out, every read returns 0, so the loop never ends.

A client can keep a server process spinning with one such request.