CVE-2026-87020
Received Received - Intake

Integer Overflow in Orthanc DICOM Server PNG Decoding

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: ICS-CERT

Description
An integer overflow in a specified pitch and buffer-size computation leads to a heap out-of-bounds write when Orthanc DICOM Server decodes an attacker-supplied PNG.

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Meta Information

Published
2026-09-11
Last Modified
2026-09-11
Generated
2026-09-11
AI Q&A
2026-09-11
EPSS Evaluated
N/A
NVD
CVE-2026-87020
EUVD
EUVD-2026-76113

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
orthanc dicom_server *
orthanc dicom_server to 1.13.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
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 occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

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Executive Summary

CVE-2026-87020 is an integer overflow vulnerability in Orthanc DICOM Server versions prior to 1.13.0. It occurs during pitch and buffer-size calculations when processing attacker-supplied PNG images, leading to a heap out-of-bounds write. This can cause the Orthanc process to crash and result in a denial-of-service condition.

Detection Guidance

To detect this vulnerability, check the version of Orthanc DICOM Server running on your system. Compare it against version 1.13.0 or later. Commands like 'orthanc --version' or checking package managers (e.g., 'dpkg -l | grep orthanc' on Debian/Ubuntu) can help identify the installed version.

Impact Analysis

This vulnerability allows an attacker to crash the Orthanc DICOM Server by sending a specially crafted PNG image. This results in a denial-of-service, disrupting medical imaging services that rely on the server. It does not require high privileges but can severely impact system availability.

Mitigation Strategies

Immediately update Orthanc DICOM Server to version 1.13.0 or later. Download the latest version from the official Orthanc website or trusted repositories. Avoid processing untrusted PNG images until the update is applied.

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