CVE-2026-5444
Received Received - Intake
Heap Buffer Overflow in Orthanc PAM Image Parsing Causes Memory Corruption

Publication date: 2026-04-09

Last updated on: 2026-04-14

Assigner: CERT/CC

Description
A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.
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Meta Information
Published
2026-04-09
Last Modified
2026-04-14
Generated
2026-06-16
AI Q&A
2026-04-09
EPSS Evaluated
2026-06-15
NVD
CVE-2026-5444
EUVD
EUVD-2026-20924
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
orthanc-server orthanc to 1.12.11 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
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Impact Analysis

The heap buffer overflow can lead to memory corruption, which may cause the application to crash or allow an attacker to execute arbitrary code. This can compromise the security and stability of the system running Orthanc, potentially leading to unauthorized access or denial of service.

Executive Summary

This vulnerability is a heap buffer overflow in the PAM image parsing logic of Orthanc. It occurs when Orthanc processes a specially crafted PAM image embedded within a DICOM file. The image dimensions are multiplied using 32-bit unsigned arithmetic, which can cause an integer overflow during the calculation of the buffer size. As a result, a smaller buffer than needed is allocated, but a much larger write operation happens during pixel processing, leading to a buffer overflow.

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