CVE-2025-11266: Grassroots Dicom Gdcm

Medium severity, CVSS 6.6. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Grassroots Dicom Gdcm: up to and including 3.0.24
• Medinria Medinria: up to and including 4.0
• Numfocus Simpleitk: up to and including 2.5.2

Published 2025-12-12. Last modified 2026-10-07.