CVE-2026-5439 Details
Description
A memory exhaustion vulnerability exists in ZIP archive processing. Orthanc automatically extracts ZIP archives uploaded to certain endpoints and trusts metadata fields describing the uncompressed size of archived files. An attacker can craft a small ZIP archive containing a forged size value, causing the server to allocate extremely large buffers during extraction.
A memory exhaustion vulnerability has been identified in Orthanc DICOM Server in versions through 1.12.10. This vulnerability arises during ZIP archive processing, where the server automatically extracts uploaded ZIP files and relies on metadata fields that describe the uncompressed size of the archived files. An attacker can create a small ZIP archive with a manipulated size value, leading the server to allocate excessively large buffers during extraction. This flaw causes the Orthanc process to terminate, creating a denial-of-service condition.
Users are advised to upgrade to Orthanc version 1.12.11, which addresses this vulnerability. After upgrading, administrators should review deployment configurations to limit exposure of upload and image processing functionality to trusted users and networks.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://kb.cert.org/vuls/id/536588 | [email protected] | Third Party AdvisoryVDB Entry |
| https://www.machinespirits.de/ | [email protected] | Not Applicable |
| https://www.orthanc-server.com/ | [email protected] | Product |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| orthanc-server orthanc | < 1.12.11 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 15, 2026 | Initial Analysis | [email protected] |
| Apr 14, 2026 | CVE Modified | CISA-ADP |
| Apr 9, 2026 | New CVE Received | [email protected] |