What is CVE-2026-5445?

CVE-2026-5445 is a critical-severity vulnerability in Orthanc Dicom Server, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2026-04-09.

How severe is CVE-2026-5445?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Out-of-bounds Read in Orthanc Dicom Server

CVE-2026-5445

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. C…

Vulnerability class: Buffer Overflow

EPSS: 0.007 (47.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Orthanc Dicom Server — versions 0
Orthanc-server Orthanc

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

cret@cert.org (Product)
cret@cert.org (Not Applicable)
cret@cert.org (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2026-5445?: CVE-2026-5445 is a critical-severity vulnerability in Orthanc Dicom Server, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2026-04-09.
How severe is CVE-2026-5445?: Critical severity. CVSS v3 base score is 9.1 out of 10.