CVE 9.1 CRITICAL

Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable)_CVE-2026-5445

April 14, 2026 invoker category_cve

9.1 / 10

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Description

An out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`. The lookup-table decoding logic used for `PALETTE COLOR` images does not validate pixel indices against the lookup table size. Crafted images containing indices larger than the palette size cause the decoder to read beyond allocated lookup table memory and expose heap contents in the output image.

AI Analysis

Out-of-bounds read vulnerability in DicomImageDecoder

Basic Information

ID CVE-2026-5445

Source certcc

Published Apr 9, 2026 at 14:42

Modified Apr 14, 2026 at 16:34

Affected Product

Vendor Orthanc

Product DICOM Server

Affected Versions Orthanc DICOM Server 0

AI Assessment

AI Score 9.1 / 10

AI Severity Critical

Vendor Orthanc

Product DICOM Server

References

{
    "lastseen": "",
    "description": "An out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`. The lookup-table decoding logic used for `PALETTE COLOR` images does not validate pixel indices against the lookup table size. Crafted images containing indices larger than the palette size cause the decoder to read beyond allocated lookup table memory and expose heap contents in the output image.",
    "published": "2026-04-09T14:42:51.673Z",
    "modified": "2026-04-14T16:34:52.024Z",
    "type": "cve",
    "title": "Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable)",
    "source": "certcc",
    "references": "https://www.orthanc-server.com/\nhttps://www.machinespirits.de/\nhttps://kb.cert.org/vuls/id/536588",
    "id": "CVE-2026-5445",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Orthanc DICOM Server 0",
    "sourceHref": "",
    "cvss": {
        "score": 9.1,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "attackComplexity": "",
            "privilegesRequired": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "DICOM Server",
    "version": "0",
    "vendor": "Orthanc",
    "ai_description": "Out-of-bounds read vulnerability in DicomImageDecoder",
    "ai_severity": "Critical",
    "ai_vendor": "Orthanc",
    "ai_product": "DICOM Server",
    "ai_version": "0",
    "ai_score": 9.1
}

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