CVE-2026-5439

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.

PUBLISHED Reserved 2026-04-02 | Published 2026-04-09 | Updated 2026-04-14 | Assigner certcc

Problem types

CWE-770 Allocation of Resources Without Limits or Throttling

Product status

References

www.orthanc-server.com/

www.machinespirits.de/

kb.cert.org/vuls/id/536588

cve.org (CVE-2026-5439)

nvd.nist.gov (CVE-2026-5439)

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