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.
History

Thu, 16 Apr 2026 03:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-789

Wed, 15 Apr 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Orthanc-server
Orthanc-server orthanc
Weaknesses CWE-770
CPEs cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*
Vendors & Products Orthanc-server
Orthanc-server orthanc

Wed, 15 Apr 2026 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-789

Tue, 14 Apr 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 10 Apr 2026 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Orthanc
Orthanc dicom Server
Vendors & Products Orthanc
Orthanc dicom Server

Thu, 09 Apr 2026 15:00:00 +0000

Type Values Removed Values Added
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.
Title Memory Exhaustion via Forged ZIP Metadata
References

cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published: 2026-04-09T14:44:37.078Z

Updated: 2026-04-14T16:34:14.439Z

Reserved: 2026-04-02T19:22:13.583Z

Link: CVE-2026-5439

cve-icon Vulnrichment

Updated: 2026-04-14T15:15:08.031Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-09T15:16:15.443

Modified: 2026-04-15T19:32:22.333

Link: CVE-2026-5439

cve-icon Redhat

No data.