{
"id": "GHSA-ff2p-hmqr-hxm4",
"aliases": [
"CVE-2026-70610"
],
"details": "### Impact\nObjects copied across the `contextBridge` boundary from untrusted content could carry an attacker-influenced prototype, enabling prototype-pollution-style attacks against preload code despite context isolation being enabled.\n\nApps are only affected if their preload code accepts object arguments from untrusted content and reads properties from them without own-property checks. Apps that only accept primitive arguments, or that validate object arguments, are not affected.\n\n### Workarounds\nValidate objects received from untrusted content with own-property checks (`Object.hasOwn`), or copy them onto a null-prototype object before use.\n\n### Fixed Versions\n* `42.0.0-beta.4`\n* `41.2.2`\n* `40.9.2`\n* `39.8.9`\n\n### For more information\nIf you have any questions or comments about this advisory, email Electron at [[email protected] ](mailto:[email protected] )",
"summary": "Electron: contextBridge object copy honors prototype setters",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "39.8.9"
}
]
}
],
"package": {
"name": "electron",
"ecosystem": "npm"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "40.0.0-alpha.1"
},
{
"fixed": "40.9.2"
}
]
}
],
"package": {
"name": "electron",
"ecosystem": "npm"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "41.0.0-alpha.1"
},
{
"fixed": "41.2.2"
}
]
}
],
"package": {
"name": "electron",
"ecosystem": "npm"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "42.0.0-alpha.1"
},
{
"fixed": "42.0.0-beta.4"
}
]
}
],
"package": {
"name": "electron",
"ecosystem": "npm"
}
}
],
"modified": "2026-08-05T17:41:21Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"
}
],
"published": "2026-08-05T17:41:20Z",
"references": [
{
"url": "https://github.com/electron/electron/security/advisories/GHSA-ff2p-hmqr-hxm4",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/pull/51083",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/pull/51084",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/pull/51085",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/pull/51086",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/commit/17d5d26499cd279fab48f5f26527f8edc02a7713",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/commit/23a6efb714dec80e2cf45d3054d18d701162e4dd",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/commit/4ac50292d552fb510eb778392620c85308770a55",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/commit/5b699544cbbed51bedb7c60d75c8c42be5825737",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron",
"type": "PACKAGE"
},
{
"url": "https://github.com/electron/electron/releases/tag/v39.8.9",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/releases/tag/v40.9.2",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/releases/tag/v41.2.2",
"type": "WEB"
},
{
"url": "https://github.com/electron/electron/releases/tag/v42.0.0-beta.4",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": null,
"github_reviewed_at": "2026-08-05T17:41:20Z"
}
}