Bug 2547948 (CVE-2026-44035)

Summary: CVE-2026-44035 dcmtk: dcmtk: Denial of Service via uncontrolled recursion in DICOMDIR processing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in DCMTK. An attacker could exploit this vulnerability by enticing a user or service to process a specially crafted DICOM directory (DICOMDIR) file containing deeply nested directory records. This issue triggers uncontrolled recursion during record processing, causing stack memory exhaustion that crashes the application and results in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2547979, 2547980    
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Description OSIDB Bzimport 2026-10-08 13:03:28 UTC
Uncontrolled recursion in DcmDicomDir::moveRecordToTree() in dcmdata/libsrc/dcdicdir.cc of OFFIS DCMTK 3.7.0 allows an attacker to cause a denial of service (stack exhaustion and process crash) via a crafted DICOMDIR file with a deeply chained sequence of directory records linked through the Offset of Referenced Lower-Level Directory Entity attribute. Any application that opens the DICOMDIR is affected, including dcmgpdir and media viewers built on DCMTK. The issue is fixed in commit ca761f7f3dcaaddaa95be87cf5d736138d7c3a9f.