Orthanc DICOM Server up to 1.12.10 DICOM Image Parser integer overflow

Summaryinfo

A vulnerability classified as critical was found in Orthanc DICOM Server up to 1.12.10. The impacted element is an unknown function of the component DICOM Image Parser. Such manipulation leads to integer overflow. This vulnerability is traded as CVE-2026-5442. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Orthanc DICOM Server up to 1.12.10 and classified as critical. Affected by this issue is an unknown function of the component DICOM Image Parser. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

This vulnerability is handled as CVE-2026-5442 since 04/02/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/12/2026).

The vulnerability scanner Nessus provides a plugin with the ID 305816 (Linux Distros Unpatched Vulnerability : CVE-2026-5442), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (305816) and EUVD (EUVD-2026-20920). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Orthanc

Name

• DICOM Server

Version

• 1.12.0
• 1.12.1
• 1.12.2
• 1.12.3
• 1.12.4
• 1.12.5
• 1.12.6
• 1.12.7
• 1.12.8
• 1.12.9
• 1.12.10

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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