Bug 2567305

Summary: CVE-2026-120632 perl-CGI: perl-CGI: Denial of Service via crafted multipart/related Content-Type header [fedora-all]
Product: [Fedora] Fedora Reporter: Marian Rehak <mrehak>
Component: perl-CGIAssignee: Jitka Plesnikova <jplesnik>
Status: MODIFIED --- 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
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["b0a7d786-ba4f-4481-a64a-fb8dd66f1508"]}
Fixed In Version: Doc Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2566593    

Description Marian Rehak 2026-11-05 13:51:45 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 CPU exhaustion via a backtracking regex on the XForms multipart/related Content-Type.

When a POST Content-Type contains multipart/related, the boundary and start parameters are extracted with an unanchored pattern that puts .+ on either side of the boundary capture, which backtracks in cubic time on a header that does not match. No request body is needed.
Comment 1 Fedora Update System 2026-11-06 09:52:56 UTC 
FEDORA-2026-a04615c725 (perl-CGI-5.02-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-a04615c725
Comment 2 Fedora Update System 2026-11-06 09:53:51 UTC 
FEDORA-2026-516e427bac (perl-CGI-5.02-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-516e427bac