CVE-2026-5440: high-severity vulnerability in Orthanc DICOM Server
Memory Exhaustion via Unbounded Content-Length
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.6%
A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header. The server allocates memory directly based on the attacker supplied header value without enforcing an upper limit. A crafted HTTP request containing an extremely large `Content-Length` value can trigger excessive memory allocation and server termination, even without sending a request body.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-2026-5443CRITICALHeap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)EPSS 0.6%CVE-2026-87020HIGHOrthanc DICOM Server Integer Overflow or WraparoundEPSS 0.6%CVE-2026-5438HIGHGzip Decompression Bomb via Content-Encoding HeaderEPSS 0.5%