high severity September 09, 2026 · 1 min read

CISA ICS Advisory: Orthanc DICOM Server

Here’s what this advisory affects, and what to do about it.

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.

CISA published an ICS medical advisory on September 09, 2026, warning that Orthanc DICOM Server contains a heap-based buffer overflow vulnerability.

Heap overflow in image decoding

The advisory states that an authenticated remote attacker can trigger the flaw by supplying a malicious PNG or JPEG image. Successful exploitation could allow the attacker to write past the end of a heap allocation, causing the Orthanc process to crash and resulting in a denial-of-service condition.

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Affected products

The vulnerability affects Orthanc DICOM Server. The advisory does not specify particular version numbers that are vulnerable or patched, nor does it state whether the flaw has been exploited in the wild.

What to do

Determine whether any Orthanc DICOM Server instances are running in your environment.
Apply the latest update or patch provided by the Orthanc project as soon as it becomes available.
Restrict network access to Orthanc servers to only trusted, authenticated clients.
Monitor the official Orthanc project channels for updated releases addressing this issue.
Review and follow all vendor-provided mitigation guidance listed in the CISA advisory.

Organisations operating medical imaging infrastructure or DICOM services should treat this advisory as high priority for review. GalaxyWarden Signals can assist security teams in tracking vendor disclosures and supply-chain updates for Orthanc and similar healthcare systems.

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Sources: CISA ICS Advisory

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