---
title: "CVE-2026-87020: Orthanc DICOM Server - Integer Overflow"
description: "Orthanc DICOM Server contains an integer overflow caused by improper pitch and buffer-size computation during PNG decoding, letting attackers cause heap out-of-bounds write, exploit requires crafted PNG input."
url: https://panop.io/threat-heartbeat/CVE-2026-87020/
---

# CVE-2026-87020 Orthanc DICOM Server - Integer Overflow

Orthanc DICOM Server contains an integer overflow caused by improper pitch and buffer-size computation during PNG decoding, letting attackers cause heap out-of-bounds write, exploit requires crafted PNG input.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.56% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-87020)

## Details

Type

Integer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Published

11 September 2026

Updated

15 October 2026

Weakness

[CWE-190](https://cwe.mitre.org/data/definitions/190.html)

## Vendor fix

Update to the latest version of Orthanc DICOM Server.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-87020](https://nvd.nist.gov/vuln/detail/CVE-2026-87020)
- [https://github.com/cisagov/CSAF/blob/develop/csaf\_files/OT/white/2026/icsma-26-253-02.json](https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsma-26-253-02.json)
- [https://orthanc.uclouvain.be/downloads/index.html](https://orthanc.uclouvain.be/downloads/index.html)
- [https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-253-02](https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-253-02)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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