Orthanc DICOM Server up to 1.12.10 Image Parser DicomImageDecoder.cpp DecodeLookupTable out-of-bounds

Summaryinfo

A vulnerability, which was classified as problematic, was found in Orthanc DICOM Server up to 1.12.10. This impacts the function DecodeLookupTable of the file DicomImageDecoder.cpp of the component Image Parser. Executing a manipulation can lead to out-of-bounds. This vulnerability is handled as CVE-2026-5445. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Orthanc DICOM Server up to 1.12.10. It has been declared as problematic. This vulnerability affects the function DecodeLookupTable of the file DicomImageDecoder.cpp of the component Image Parser. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. CVE summarizes:

An out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`. The lookup-table decoding logic used for `PALETTE COLOR` images does not validate pixel indices against the lookup table size. Crafted images containing indices larger than the palette size cause the decoder to read beyond allocated lookup table memory and expose heap contents in the output image.

This vulnerability was named CVE-2026-5445 since 04/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 305811 (Linux Distros Unpatched Vulnerability : CVE-2026-5445), 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 (305811) and EUVD (EUVD-2026-20926). Once again VulDB remains the best source for vulnerability data.

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

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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