Electron: HTTP Response Header Injection in custom protocol handlers and webRequest_CVE-2026-34767

{
    "lastseen": "",
    "description": "Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.3, 40.8.3, and 41.0.3, apps that register custom protocol handlers via protocol.handle() / protocol.registerSchemesAsPrivileged() or modify response headers via webRequest.onHeadersReceived may be vulnerable to HTTP response header injection if attacker-controlled input is reflected into a response header name or value. An attacker who can influence a header value may be able to inject additional response headers, affecting cookies, content security policy, or cross-origin access controls. Apps that do not reflect external input into response headers are not affected. This issue has been patched in versions 38.8.6, 39.8.3, 40.8.3, and 41.0.3.",
    "published": "2026-04-03T23:43:09.327Z",
    "modified": "2026-04-06T19:07:57.198Z",
    "type": "cve",
    "title": "Electron: HTTP Response Header Injection in custom protocol handlers and webRequest",
    "source": "GitHub_M",
    "references": "https://github.com/electron/electron/security/advisories/GHSA-4p4r-m79c-wq3v",
    "id": "CVE-2026-34767",
    "bulletinFamily": "",
    "cwe": [
        "CWE-74",
        "CWE-113"
    ],
    "cvelist": null,
    "sourceData": "electron electron < 38.8.6\nelectron electron >= 39.0.0-alpha.1, < 39.8.3\nelectron electron >= 40.0.0-alpha.1, < 40.8.3\nelectron electron >= 41.0.0-alpha.1, < 41.0.3",
    "sourceHref": "",
    "cvss": {
        "score": 5.9,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "electron",
    "version": "< 38.8.6",
    "vendor": "electron",
    "ai_description": "",
    "ai_severity": "",
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    "ai_product": "",
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    "ai_score": 0
}