CVE-2026-5439Memory Exhaustion via Forged ZIP Metadata
Updated under an hour ago ()
Does this affect you?
It affects Orthanc DICOM Server and 1 other product. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.76%, higher than 54% of scored CVEs.
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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.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.76% (percentile 54)
- Assigned by
- certcc
- NVD analysis
- Analyzed
- Record last updated
- Apr 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Orthanc DICOM Server orthanc:dicom_server (from the name) | through 1.12.10 | CNA record |
orthanc-server orthanc orthanc-server:orthanc | before 1.12.11 | NVD |
References
- https://www.orthanc-server.com/product
- https://www.machinespirits.de/not-applicable
- https://kb.cert.org/vuls/id/536588third-party-advisory, vdb-entry
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.