CVE-2026-5443Network attack vector

Persistent server crash via wrapped buffer sizing

Published Apr 9, 2026 · Updated Apr 9, 2026

Heap buffer overflow in Orthanc DICOM Server 1.12.10 and earlier allows remote attackers to crash the service via a crafted DICOM image. DicomImageDecoder validates PALETTE COLOR pixel length and allocates an RGB24 buffer with wrapped 32-bit dimension arithmetic, then iterates over the original dimensions. Unauthenticated C-STORE access can plant the image under the default configuration; rendering the stored image repeatedly terminates the Orthanc process.

CVSS severity9.8
Critical
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Orthanc DICOM Server 1.12.10 and earlier allows remote attackers to crash the service via a crafted DICOM image. DicomImageDecoder validates PALETTE COLOR pixel length and allocates an RGB24 buffer with wrapped 32-bit dimension arithmetic, then iterates over the original dimensions. Unauthenticated C-STORE access can plant the image under the default configuration; rendering the stored image repeatedly terminates the Orthanc process.

The record

CVE
CVE-2026-5443
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Orthanc
Product
Orthanc
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.12.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Orthanc · Orthancversion=0 <=1.12.10

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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