What’s Vulnerable › Vulnerabilities

CVE-2025-11266: Grassroots DICOM (GDCM) Out-of-bounds Write

• Severity: medium (CVSS 6.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-12 · updated 2026-10-07
• Weakness: CWE-787

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.

Affected products

• Grassroots DICOM (GDCM): through 3.0.24
• medInria: through 4.0
• NumFocus SimpleITK: through 2.5.2

References

• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2025/icsma-25-345-01.json
• https://github.com/malaterre/GDCM/releases/tag/v3.2.2
• https://www.cisa.gov/news-events/ics-medical-advisories/icsma-25-345-01
• https://github.com/malaterre/GDCM/commit/5829c95c8ac3afa9a3a3413675e948959c28a789

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