{"id":"CVE-2026-70610","aliases":["GHSA-ff2p-hmqr-hxm4"],"url":"https://o3.security/vulnerability/CVE-2026-70610","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)","published":"2026-08-05T17:41:03.016Z","modified":"2026-10-28T11:01:23.875239175Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"electron","fixedVersion":"39.8.9"},{"ecosystem":"npm","name":"electron","fixedVersion":"40.9.2"},{"ecosystem":"npm","name":"electron","fixedVersion":"41.2.2"},{"ecosystem":"npm","name":"electron","fixedVersion":"42.0.0-beta.4"}],"fix":{"url":"https://github.com/electron/electron/commit/17d5d26499cd279fab48f5f26527f8edc02a7713","label":"electron/electron@17d5d26"},"references":[{"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"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70610.json"},{"type":"ADVISORY","url":"https://github.com/electron/electron/security/advisories/GHSA-ff2p-hmqr-hxm4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70610"},{"type":"FIX","url":"https://github.com/electron/electron/commit/17d5d26499cd279fab48f5f26527f8edc02a7713"},{"type":"FIX","url":"https://github.com/electron/electron/commit/23a6efb714dec80e2cf45d3054d18d701162e4dd"},{"type":"FIX","url":"https://github.com/electron/electron/commit/4ac50292d552fb510eb778392620c85308770a55"},{"type":"FIX","url":"https://github.com/electron/electron/commit/5b699544cbbed51bedb7c60d75c8c42be5825737"},{"type":"FIX","url":"https://github.com/electron/electron/pull/51083"},{"type":"FIX","url":"https://github.com/electron/electron/pull/51084"},{"type":"FIX","url":"https://github.com/electron/electron/pull/51085"},{"type":"FIX","url":"https://github.com/electron/electron/pull/51086"},{"type":"PACKAGE","url":"https://github.com/electron/electron"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T11:01:23.875239175Z"}}