CVE-2026-5439 — HIGH (7.5) — White Hats Nepal

Q: How severe is CVE-2026-5439?

CVE-2026-5439 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-5439?

Check the references section above for vendor advisories and patch information. Affected products include: Orthanc-Server Orthanc.

Vulnerability 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.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Orthanc-Server	Orthanc	< 1.12.11

Related Weaknesses (CWE)

CWE-770

References

https://kb.cert.org/vuls/id/536588Third Party AdvisoryVDB Entry
https://www.machinespirits.de/Not Applicable
https://www.orthanc-server.com/Product

FAQ

What is CVE-2026-5439?

CVE-2026-5439 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 siz...

How severe is CVE-2026-5439?

CVE-2026-5439 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-5439?

Check the references section above for vendor advisories and patch information. Affected products include: Orthanc-Server Orthanc.