CVE-2026-5445 — CRITICAL (9.1)

Q: How severe is CVE-2026-5445?

CVE-2026-5445 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-5445?

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

Vulnerability Description

An out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`. The lookup-table decoding logic used for `PALETTE COLOR` images does not validate pixel indices against the lookup table size. Crafted images containing indices larger than the palette size cause the decoder to read beyond allocated lookup table memory and expose heap contents in the output image.

CVSS Score

9.1

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Orthanc-Server	Orthanc	< 1.12.11

Related Weaknesses (CWE)

CWE-125

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-2026-5445?

CVE-2026-5445 is a vulnerability with a CVSS score of 9.1 (CRITICAL). An out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`. The lookup-table decoding logic used for `PALETTE COLOR` images does not validate pixel i...

How severe is CVE-2026-5445?

CVE-2026-5445 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-5445?

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