# CVE-2026-5443: orthanc: A heap buffer overflow vulnerability exists during the decoding of `PALETTE COLOR` DICOM images

CVE-2026-5443 is fixed in orthanc on 1 platform by DEBIAN-CVE-2026-5443 (version 1.12.10+dfsg-4), released April 9, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-5443
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0058
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 9, 2026

## Description

A heap buffer overflow vulnerability exists during the decoding of `PALETTE COLOR` DICOM images. Pixel length validation uses 32-bit multiplication for width and height calculations. If these values overflow, the validation check incorrectly succeeds, allowing the decoder to read and write to memory beyond allocated buffers.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | orthanc Debian 14 | 1.12.10+dfsg-4 | [DEBIAN-CVE-2026-5443](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5443.md) | Apr 9, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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