OpenEXR: Integer overflow in the HTJ2K decoder leads to heap-buffer-overflow_CVE-2026-44663

{
    "lastseen": "",
    "description": "OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions 3.4.0 through 3.4.11, an integer overflow in ht_undo_impl() in src/lib/OpenEXRCore/internal_ht.cpp leads to a heap-buffer overflow when decoding a crafted HTJ2K-compressed EXR file. decode->channels[i].width (int32_t) is multiplied by bytes_per_element in 32-bit signed arithmetic. With large widths (e.g., >= 536870912 for FLOAT data), this overflows, producing a corrupted offset that is later used for pointer arithmetic and can cause a heap out-of-bounds write. The same unchecked multiplication pattern appears in two other HTJ2K paths (bytes-per-line accumulation and pixel-line pointer advancement). As with related CVE-2026-34378 through CVE-2026-34589 fixes in other codecs, validating only after the multiplication is too late because the value may already be overflowed. This issue has been fixed in version 3.4.12.",
    "published": "2026-06-18T20:20:15.532Z",
    "modified": "2026-06-18T20:20:15.532Z",
    "type": "cve",
    "title": "OpenEXR: Integer overflow in the HTJ2K decoder leads to heap-buffer-overflow",
    "source": "GitHub_M",
    "references": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-777r-f9x8-7r84\nhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.12",
    "id": "CVE-2026-44663",
    "bulletinFamily": "",
    "cwe": [
        "CWE-190",
        "CWE-787"
    ],
    "cvelist": null,
    "sourceData": "AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.11",
    "sourceHref": "",
    "cvss": {
        "score": 6.1,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "confidentialityImpact": "",
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        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "openexr",
    "version": ">= 3.4.0, < 3.4.11",
    "vendor": "AcademySoftwareFoundation",
    "ai_description": "",
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    "ai_score": 0
}