CVE-2026-5439 — Memory Exhaustion via Forged ZIP Metadata

CVE-2026-5439

Memory Exhaustion via Forged ZIP Metadata PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Orthanc / DICOM Server	affected 0 through 1.12.10

CWE

No CWE identifiers supplied.

References

https://www.orthanc-server.com/
https://www.machinespirits.de/
https://kb.cert.org/vuls/id/536588

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.