Critical severity · published Apr 9, 2026
CVE-2026-5443
Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)
9.8
CVSS
0.6%
EPSS
No
On KEV
Description
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 incorrectly succeeds, allowing the decoder to read and write to memory beyond allocated buffers.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DS
DICOM Server · Orthanc
through 1.12.10 · source: vendor
OR
Orthanc · Orthanc-server
before 1.12.11 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5443
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5443
Third Party Advisory
https://kb.cert.org/vuls/id/536588
Not Applicable
https://www.machinespirits.de/
Product
https://www.orthanc-server.com/
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