# CVE-2025-11266: gdcm: An out-of-bounds write vulnerability exists in the Grassroots DICOM library (GDCM)

CVE-2025-11266 is fixed in gdcm on 1 platform by DEBIAN-CVE-2025-11266 (version 3.0.24-11), released December 12, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-11266
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 12, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gdcm Debian 14 | 3.0.24-11 | [DEBIAN-CVE-2025-11266](https://patchblox.com/security/data/fix/linux/debian-cve-2025-11266.md) | Dec 12, 2025 |

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