CVE-2026-5442 — CRITICAL (9.8)

Q: How severe is CVE-2026-5442?

CVE-2026-5442 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-5442?

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

Vulnerability Description

A heap buffer overflow vulnerability exists in the DICOM image decoder. Dimension fields are encoded using Value Representation (VR) Unsigned Long (UL), instead of the expected VR Unsigned Short (US), which allows extremely large dimensions to be processed. This causes an integer overflow during frame size calculation and results in out-of-bounds memory access during image decoding.

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Orthanc-Server	Orthanc	< 1.12.11

Related Weaknesses (CWE)

CWE-787

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-2026-5442?

CVE-2026-5442 is a vulnerability with a CVSS score of 9.8 (CRITICAL). A heap buffer overflow vulnerability exists in the DICOM image decoder. Dimension fields are encoded using Value Representation (VR) Unsigned Long (UL), instead of the expected VR Unsigned Short (US),...

How severe is CVE-2026-5442?

CVE-2026-5442 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-5442?

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