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    CVE-2026-5440

    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.

    Published:Apr 9, 2026
    Last Modified:Apr 15, 2026
    EPS:Apr 9, 2026
    EPSS Score:0.01638
    CVSS Score:7.5

    Affected Products

    Vendor
    Orthanc
    Product
    Dicom Server
    Vendor
    Orthanc-server
    Product
    Orthanc

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-5438 (CVSS 7.5) — A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzi…
    CVE-2026-5442 (CVSS 9.8) — A heap buffer overflow vulnerability exists in the DICOM image decoder. Dimension fields are encoded using Val…
    CVE-2026-5443 (CVSS 9.8) — A heap buffer overflow vulnerability exists during the decoding of `PALETTE COLOR` DICOM images. Pixel length …
    CVE-2026-5445 (CVSS 9.1) — An out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`.…
    CVE-2026-5444 (CVSS 7.1) — A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted P…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High