{"id":"CVE-2026-70601","aliases":["GHSA-h7rp-cf8h-j98x"],"url":"https://o3.security/vulnerability/CVE-2026-70601","summary":"Electron: Context isolation bypass via Function.prototype.bind hijack","details":"### Impact\nApps that expose Promise-returning functions to web content via `contextBridge` may be vulnerable to a context isolation bypass. Untrusted web content could obtain access to the isolated preload world and, through it, every capability the preload script has. In renderers without a sandbox, or with `nodeIntegration` enabled, this may escalate to Node.js access.\n\nApps are affected if they expose Promise-returning functions via `contextBridge` — the standard pattern for wrapping `ipcRenderer.invoke` — in windows that load untrusted content. Apps that never load untrusted content in those windows are not affected.\n\n### Workarounds\nThere are no app side workarounds, you must update to a patched version of Electron.\n\n### Fixed Versions\n* `42.0.0-beta.5`\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":"2026-08-05T15:45:31.315Z","modified":"2026-10-28T11:22:35.202085445Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N"},"epss":{"score":0.00245,"percentile":0.15911,"asOf":"2026-09-17"},"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.5"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70601.json"},{"type":"ADVISORY","url":"https://github.com/electron/electron/security/advisories/GHSA-h7rp-cf8h-j98x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70601"},{"type":"PACKAGE","url":"https://github.com/electron/electron"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T11:22:35.202085445Z"}}