Bug 2547949 (CVE-2026-44037)

Summary:	CVE-2026-44037 dcmtk: dcmtk: Denial of Service via deeply nested DICOM JSON document
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in dcmtk. An attacker can cause a Denial of Service (DoS) by providing a crafted DICOM (Digital Imaging and Communications in Medicine) JSON document containing deeply nested sequence values. Processing this input triggers uncontrolled recursion in the JSON parser, causing stack memory exhaustion and crashing the application.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2548021, 2548024
Bug Blocks:

Description OSIDB Bzimport 2026-10-08 13:04:26 UTC

Uncontrolled mutual recursion between DcmJSONReader::parseDataSet(), DcmJSONReader::parseElement() and DcmJSONReader::parseSequence() in dcmdata/libsrc/dcjsonrd.cc of OFFIS DCMTK 3.7.0 allows an attacker to cause a denial of service (stack exhaustion and process crash) via a crafted DICOM JSON document with deeply nested sequence (SQ) values. The json2dcm tool and any service that converts untrusted DICOM JSON (for example, DICOMweb payloads) with this reader are affected. The issue is fixed in commit cf955e64c35a1e07ba10698f639d5dcdec53b9d7.