CVE-2026-5442Network attack vector

Persistent service crash via wrapped frame-size calculation

Published Apr 9, 2026 · Updated Apr 9, 2026

Heap buffer over-read in Orthanc 1.12.10 and earlier allows remote attackers to crash the server through a crafted DICOM image. DicomImageInformation::GetFrameSize multiplies UL-encoded Rows and Columns in 32-bit arithmetic until the frame size wraps, then ImageProcessing::Copy uses the declared width as the memcpy pitch and reads beyond the pixel buffer. An unauthenticated host can store the image through default C-STORE access, but a preview request triggers the persistent crash; code execution has not been demonstrated.

CVSS severity9.8
Critical
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer over-read in Orthanc 1.12.10 and earlier allows remote attackers to crash the server through a crafted DICOM image. DicomImageInformation::GetFrameSize multiplies UL-encoded Rows and Columns in 32-bit arithmetic until the frame size wraps, then ImageProcessing::Copy uses the declared width as the memcpy pitch and reads beyond the pixel buffer. An unauthenticated host can store the image through default C-STORE access, but a preview request triggers the persistent crash; code execution has not been demonstrated.

The record

CVE
CVE-2026-5442
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Orthanc
Product
Orthanc
Classifications
CWE-787, T1190
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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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
T1190Exploit Public-Facing Application

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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