A memory exhaustion vulnerability exists in ZIP archive processing.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Apr 9, 2026 · NIST NVD

   Detected

   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.

2. Jun 17, 2026 · NIST NVD

   Updated

   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

• cpe orthanc-server/orthancversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-5439

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-5439

  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 forg

  nvd.nist.gov

References

• Third Party Advisory · kb.cert.org
• Not Applicable · machinespirits.de
• Product · orthanc-server.com