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CVE-2026-5442

Orthanc-server Orthanc buffer overflow

9.8 CRITICALEPSS 0.92%
  1. Published9 Apr 2026

Description

A heap buffer overflow vulnerability exists in the DICOM image decoder. Dimension fields are encoded using Value Representation (VR) Unsigned Long (UL), instead of the expected VR Unsigned Short (US), which allows extremely large dimensions to be processed. This causes an integer overflow during frame size calculation and results in out-of-bounds memory access during image decoding.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Orthanc-server Orthanc< 1.12.11

Remediation

Fixed in
Orthanc-server Orthanc≥ 1.12.11

References

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Frequently asked

Is CVE-2026-5442 being actively exploited?

CVE-2026-5442 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.92%.

How severe is CVE-2026-5442?

CVE-2026-5442 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.92% probability of exploitation.

Which products are affected by CVE-2026-5442?

Affected products include Orthanc-server Orthanc.

How do I fix CVE-2026-5442?

Upgrade affected software to a fixed version, for example Orthanc-server Orthanc 1.12.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-5442 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.