CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp_CVE-2026-42146

{
    "lastseen": "",
    "description": "CImg Library is a C++ library for image processing. Prior to commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5.",
    "published": "2026-05-04T17:53:23.830Z",
    "modified": "2026-05-04T17:53:23.830Z",
    "type": "cve",
    "title": "CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp",
    "source": "GitHub_M",
    "references": "https://github.com/GreycLab/CImg/security/advisories/GHSA-g54r-qmgx-c6fv\nhttps://github.com/GreycLab/CImg/issues/477\nhttps://github.com/GreycLab/CImg/commit/c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3\nhttps://github.com/GreycLab/CImg/releases/tag/v.3.7.5",
    "id": "CVE-2026-42146",
    "bulletinFamily": "",
    "cwe": [
        "CWE-789"
    ],
    "cvelist": null,
    "sourceData": "GreycLab CImg < c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3",
    "sourceHref": "",
    "cvss": {
        "score": 5.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "CImg",
    "version": "< c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3",
    "vendor": "GreycLab",
    "ai_description": "",
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    "ai_score": 0
}