OpenEXR has a signed integer overflow in generic_unpack() when parsing EXR files with crafted negative dataWindow.min.x_CVE-2026-34378

{
    "lastseen": "",
    "description": "OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.4.0 to before 3.4.9, a missing bounds check on the dataWindow attribute in EXR file headers allows an attacker to trigger a signed integer overflow in generic_unpack(). By setting dataWindow.min.x to a large negative value, OpenEXRCore computes an enormous image width, which is later used in a signed integer multiplication that overflows, causing the process to terminate with SIGILL via UBSan. This vulnerability is fixed in 3.4.9.",
    "published": "2026-04-06T15:19:34.871Z",
    "modified": "2026-04-07T03:07:17.341Z",
    "type": "cve",
    "title": "OpenEXR has a signed integer overflow in generic_unpack() when parsing EXR files with crafted negative dataWindow.min.x",
    "source": "GitHub_M",
    "references": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-v76p-4qvv-vh4g\nhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9",
    "id": "CVE-2026-34378",
    "bulletinFamily": "",
    "cwe": [
        "CWE-190"
    ],
    "cvelist": null,
    "sourceData": "AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.9",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
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        "confidentialityImpact": "",
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        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "openexr",
    "version": ">= 3.4.0, < 3.4.9",
    "vendor": "AcademySoftwareFoundation",
    "ai_description": "",
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    "ai_score": 0
}