Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow_CVE-2026-54257

{
    "lastseen": "",
    "description": "Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From 42.3.1 until 42.3.3, Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow. Most apps will crash and some may perform incorrect buffer allocations in the Node.js Buffer API resulting in unexpected truncation or allocation. This vulnerability is fixed in 42.3.3.",
    "published": "2026-06-23T17:08:31.786Z",
    "modified": "2026-06-23T17:47:47.594Z",
    "type": "cve",
    "title": "Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow",
    "source": "GitHub_M",
    "references": "https://github.com/electron/electron/security/advisories/GHSA-q6m5-f73j-m9mc",
    "id": "CVE-2026-54257",
    "bulletinFamily": "",
    "cwe": [
        "CWE-120"
    ],
    "cvelist": null,
    "sourceData": "electron electron >= 42.3.1, < 42.3.3",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "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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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "electron",
    "version": ">= 42.3.1, < 42.3.3",
    "vendor": "electron",
    "ai_description": "Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow",
    "ai_severity": "Critical",
    "ai_vendor": "Electron",
    "ai_product": "Electron Framework",
    "ai_version": "42.3.1-42.3.3",
    "ai_score": 9.3
}