CVE-2026-5437Network attack vector

Server crash via unchecked DICOM value length

Published Apr 9, 2026 · Updated Apr 9, 2026

Out-of-bounds read in Orthanc DICOM Server 1.12.10 and earlier allows remote attackers to crash the server via crafted DICOM uploads. DicomStreamReader::HandleMetaHeader trusts each meta-header tag's declared value length and passes it to std::string::assign without confirming that the value remains inside the group-length-sized heap block. The vulnerable path is HTTP POST /instances; C-STORE regenerates meta-headers, and stock builds generally neither crash nor expose the extra bytes.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Orthanc DICOM Server 1.12.10 and earlier allows remote attackers to crash the server via crafted DICOM uploads. DicomStreamReader::HandleMetaHeader trusts each meta-header tag's declared value length and passes it to std::string::assign without confirming that the value remains inside the group-length-sized heap block. The vulnerable path is HTTP POST /instances; C-STORE regenerates meta-headers, and stock builds generally neither crash nor expose the extra bytes.

The record

CVE
CVE-2026-5437
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Orthanc
Product
Orthanc
Classifications
CWE-125, 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

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-125Out-of-bounds Read
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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