{"id":"GHSA-ff2p-hmqr-hxm4","summary":"Electron: contextBridge object copy honors prototype setters","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 [security@electronjs.org](mailto:security@electronjs.org)","aliases":["CVE-2026-70610"],"modified":"2026-08-05T17:56:07.830265Z","published":"2026-08-05T17:41:20Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-08-05T17:41:20Z","nvd_published_at":null,"cwe_ids":["CWE-1321"]},"references":[{"type":"WEB","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":"PACKAGE","url":"https://github.com/electron/electron"},{"type":"WEB","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"}],"affected":[{"package":{"name":"electron","ecosystem":"npm","purl":"pkg:npm/electron"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"39.8.9"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-ff2p-hmqr-hxm4/GHSA-ff2p-hmqr-hxm4.json"}},{"package":{"name":"electron","ecosystem":"npm","purl":"pkg:npm/electron"},"ranges":[{"type":"SEMVER","events":[{"introduced":"40.0.0-alpha.1"},{"fixed":"40.9.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-ff2p-hmqr-hxm4/GHSA-ff2p-hmqr-hxm4.json"}},{"package":{"name":"electron","ecosystem":"npm","purl":"pkg:npm/electron"},"ranges":[{"type":"SEMVER","events":[{"introduced":"41.0.0-alpha.1"},{"fixed":"41.2.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-ff2p-hmqr-hxm4/GHSA-ff2p-hmqr-hxm4.json"}},{"package":{"name":"electron","ecosystem":"npm","purl":"pkg:npm/electron"},"ranges":[{"type":"SEMVER","events":[{"introduced":"42.0.0-alpha.1"},{"fixed":"42.0.0-beta.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-ff2p-hmqr-hxm4/GHSA-ff2p-hmqr-hxm4.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"}]}