CVE-2025-11266

Grassroots DICOM (GDCM) Out-of-bounds Write

Published Dec 12, 2025 CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

The maintainer of the software recommends users update Grassroots DICOM (GDCM) to v3.2.2 or later https://github.com/malaterre/GDCM/releases/tag/v3.2.2  from the main GitHub repository. SimpleITK and medInria have both released fixes for the vulnerability.

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4652-1 gdcm security update
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Grassroots Dicom Project
Grassroots Dicom Project grassroots Dicom
Malaterre
Malaterre grassroots Dicom
Vendors & Products Grassroots Dicom Project
Grassroots Dicom Project grassroots Dicom
Malaterre
Malaterre grassroots Dicom
Type Values Removed Values Added
Description 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.
Title Grassroots DICOM (GDCM) Out-of-bounds Write
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 6.6, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H'}

cvssV4_0

{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
icscert
Published
Updated
Jan 20, 2026, 8:25 PM
Reserved
Oct 3, 2025, 3:37 PM
Status
Deferred
Published
Dec 12, 2025, 9:15 PM
Modified
Oct 7, 2026, 8:10 PM
Severity
Moderate
Public date
Dec 12, 2025, 8:48 PM