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    CVE-2026-5438

    A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits on decompressed size and allocates memory based on attacker-controlled compression metadata. A specially crafted gzip payload can trigger excessive memory allocation and exhaust system memory.

    Published:Apr 9, 2026
    Last Modified:Apr 15, 2026
    EPS:Apr 9, 2026
    EPSS Score:0.0005
    CVSS Score:7.5

    Affected Products

    Vendor
    Orthanc
    Product
    Dicom Server
    Vendor
    Orthanc-server
    Product
    Orthanc

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-10528 (CVSS 1.9) — A security flaw has been discovered in Orthanc DICOM Server up to 1.12.11. This issue affects the function Dcm…
    CVE-2026-5439 (CVSS 7.5) — A memory exhaustion vulnerability exists in ZIP archive processing. Orthanc automatically extracts ZIP archive…
    CVE-2026-5437 (CVSS 7.5) — An out-of-bounds read vulnerability exists in `DicomStreamReader` during DICOM meta-header parsing. When proce…
    CVE-2026-5440 (CVSS 7.5) — A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` heade…
    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…
    CVE-2026-5441 (CVSS 7.1) — An out-of-bounds read vulnerability exists in the `DecodePsmctRle1` function of `DicomImageDecoder.cpp`. The `…

    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