What is CVE-2026-5443?

CVE-2026-5443 is a critical-severity vulnerability in Orthanc Dicom Server, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-04-09.

How severe is CVE-2026-5443?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Orthanc Dicom Server

CVE-2026-5443

A heap buffer overflow vulnerability exists during the decoding of `PALETTE COLOR` DICOM images. Pixel length validation uses 32-bit multiplication for width and height calculations. If these values overflow, the validation check incorrect…

Vulnerability class: Buffer Overflow

EPSS: 0.006 (43.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Orthanc Dicom Server — versions 0
Orthanc-server Orthanc

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2026-5443?: CVE-2026-5443 is a critical-severity vulnerability in Orthanc Dicom Server, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-04-09.
How severe is CVE-2026-5443?: Critical severity. CVSS v3 base score is 9.8 out of 10.