Bug 2566599 (CVE-2026-120651)

Summary: CVE-2026-120651 perl-cgi: perl-cgi: Denial of Service via truncated request body
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. A remote attacker can trigger a denial of service (DoS) by sending an HTTP request containing a body shorter than its declared Content-Length header. When file upload processing is disabled, the server enters an infinite loop attempting to discard remaining data, consuming excessive CPU resources and rendering the affected server process unresponsive.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2567316    
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Description OSIDB Bzimport 2026-11-03 23:51:47 UTC 
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.