Bug 2421861 (CVE-2025-11266)

Summary: CVE-2025-11266 GDCM: Grassroots DICOM: Grassroots DICOM (GDCM): Denial of Service via malformed DICOM file parsing
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: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Grassroots DICOM library (GDCM). A remote attacker could exploit an out-of-bounds write vulnerability by tricking a user into opening a specially crafted DICOM file. This file, containing malformed image data, triggers an unsigned integer underflow during parsing, leading to an out-of-bounds memory access. Successful exploitation results in a denial-of-service condition, causing the application to crash.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2428865, 2428866, 2428868, 2428867    
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Description OSIDB Bzimport 2025-12-12 21:02:31 UTC 
An out-of-bounds write vulnerability exists in the Grassroots DICOM library (GDCM). The issue is triggered during parsing of a malformed DICOM file containing encapsulated PixelData fragments (compressed image data stored as multiple fragments). This vulnerability leads to a segmentation fault caused by an out-of-bounds memory access due to unsigned integer underflow in buffer indexing. It is exploitable via file input, simply opening a crafted malicious DICOM file is sufficient to trigger the crash, resulting in a denial-of-service condition.