CVE-2026-5443: critical vulnerability in Orthanc DICOM Server
Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 0.6%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Orthanc · DICOM ServerRelated CVEs — Orthanc DICOM Server
In the same product, most dangerous first.
CVE-2026-5445CRITICALOut-of-Bounds Read in DicomImageDecoder (DecodeLookupTable)EPSS 0.7%CVE-2026-5437HIGHOut-of-Bounds Read in DicomStreamReaderEPSS 0.7%CVE-2026-5442CRITICALHeap Buffer Overflow in DICOM Image Decoder via VR UL DimensionsEPSS 0.6%CVE-2026-5440HIGHMemory Exhaustion via Unbounded Content-LengthEPSS 0.6%CVE-2026-87020HIGHOrthanc DICOM Server Integer Overflow or WraparoundEPSS 0.6%CVE-2026-5438HIGHGzip Decompression Bomb via Content-Encoding HeaderEPSS 0.5%