Orthanc DICOM Server
All CISA Advisories, CISA, September 10, 2026
Summary
Successful exploitation of this vulnerability could allow an authenticated remote attacker to write past the end of a heap allocation when Orthanc decodes an attacker-supplied PNG or JPEG image, resulting in a crash of the Orthanc process and a denial-of-service condition.
The following versions of Orthanc DICOM Server are affected:
- Orthanc DICOM Server <1.13.0. (CVE-2026-87020)
| CVSS | Vendor | Equipment | Vulnerabilities |
|---|---|---|---|
| v3 8.1 | Orthanc | Orthanc DICOM Server | Integer Overflow or Wraparound |
Background
- Critical Infrastructure Sectors: Healthcare and Public Health
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: Belgium
Vulnerabilities
CVE-2026-87020
An integer overflow in a specified pitch and buffer-size computation leads to a heap out-of-bounds write when Orthanc decodes an attacker-supplied PNG.
Affected Products
Orthanc DICOM Server
Orthanc
Orthanc Orthanc DICOM Server: <1.13.0.
known_affected
Remediations
Mitigation
Orthanc recommends users update to v1.13.0.
https://orthanc.uclouvain.be/downloads/index.html
Relevant CWE: CWE-190 Integer Overflow or Wraparound
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
|---|---|---|---|
| 3.1 | 8.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
| 4.0 | 7.2 | HIGH | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N |
Acknowledgments
- Andrej Tomci reported this vulnerability to CISA.
Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability.
Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
Do not click web links or open attachments in unsolicited email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.
Revision History
- Initial Release Date: 2026-09-10
| Date | Revision | Summary |
|---|---|---|
| 2026-09-10 | 1 | Initial Publication |
