What’s Vulnerable › Vulnerabilities

CVE-2026-87020: Orthanc DICOM Server Integer Overflow or Wraparound

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-09-18
• Weakness: CWE-190

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.

Affected products

• Orthanc DICOM Server: before 1.13.0 — fixed in 1.13.0

How to fix

Upgrade to a fixed version: Orthanc DICOM Server 1.13.0. Check the vendor advisory for mitigations.

References

• 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://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-253-02

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