---
id: CVE-2026-87020
title: "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."
summary: "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."
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-190
vendor: Orthanc
product: DICOM Server
affected:
  - dicom_server < 1.13.0
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:40:31.053'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87020'
references:
  - url: >-
      https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsma-26-253-02.json
    label: ics-cert@hq.dhs.gov
  - url: 'https://orthanc.uclouvain.be/downloads/index.html'
    label: ics-cert@hq.dhs.gov
  - url: 'https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-253-02'
    label: ics-cert@hq.dhs.gov
tags:
  - nvd
  - cve.org
epss: 0.0056
epssPercentile: 0.44265
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-11T14:51:25.708590Z'
ingestedAt: '2026-09-11T16:45:47.861Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.