CVE-2026-5442
Critical
Description
A heap buffer overflow vulnerability exists in the DICOM image decoder. Dimension fields are encoded using Value Representation (VR) Unsigned Long (UL), instead of the expected VR Unsigned Short (US), which allows extremely large dimensions to be processed. This causes an integer overflow during frame size calculation and results in out-of-bounds memory access during image decoding.
SeverityCritical
CVSS9.8
Exploit probability—
ProductOrthanc
PublishedApr 9, 2026
First seenApr 9, 2026
Weakness typeCWE-190Integer overflow
How to fix
Update
- orthanc-server orthanc1.12.11 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| orthanc-server orthanc | v < 1.12.11 | 1.12.11 |
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