CVE-2026-5439

Name: CVE-2026-5439
Creator: NVD / NIST
Published: 2026-04-09T15:16:15.443+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.43%

Last modified Jun 17, 2026

CVE-2026-5439 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.43%

34.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Orthanc-Server	Orthanc	< 1.12.11

References

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

Timeline

Published: Apr 9, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-5439?

How severe is CVE-2026-5439?

CVE-2026-5439 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.

How do I fix CVE-2026-5439?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-5439?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST