{"id":"GHSA-532v-xpq5-8h95","summary":"Electron: Use-after-free in offscreen child window paint callback","details":"### Impact\nApps that use offscreen rendering and allow child windows via `window.open()` may be vulnerable to a use-after-free. If the parent offscreen `WebContents` is destroyed while a child window remains open, subsequent paint frames on the child dereference freed memory, which may lead to a crash or memory corruption.\n\nApps are only affected if they use offscreen rendering (`webPreferences.offscreen: true`) and their `setWindowOpenHandler` permits child windows. Apps that do not use offscreen rendering, or that deny child windows, are not affected.\n\n### Workarounds\nDeny child window creation from offscreen renderers in your `setWindowOpenHandler`, or ensure child windows are closed before the parent is destroyed.\n\n### Fixed Versions\n* `41.0.0`\n* `40.7.0`\n* `39.8.1`\n\n### For more information\nIf there are any questions or comments about this advisory, please email [security@electronjs.org](mailto:security@electronjs.org)","aliases":["CVE-2026-34774"],"modified":"2026-04-06T23:19:58.922968Z","published":"2026-04-03T02:42:27Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-04-03T02:42:27Z","nvd_published_at":"2026-04-04T00:16:18Z","cwe_ids":["CWE-416"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/electron/electron/security/advisories/GHSA-532v-xpq5-8h95"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34774"},{"type":"PACKAGE","url":"https://github.com/electron/electron"}],"affected":[{"package":{"name":"electron","ecosystem":"npm","purl":"pkg:npm/electron"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"39.8.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-532v-xpq5-8h95/GHSA-532v-xpq5-8h95.json"}},{"package":{"name":"electron","ecosystem":"npm","purl":"pkg:npm/electron"},"ranges":[{"type":"SEMVER","events":[{"introduced":"40.0.0-alpha.1"},{"fixed":"40.7.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-532v-xpq5-8h95/GHSA-532v-xpq5-8h95.json"}},{"package":{"name":"electron","ecosystem":"npm","purl":"pkg:npm/electron"},"ranges":[{"type":"SEMVER","events":[{"introduced":"41.0.0-alpha.1"},{"fixed":"41.0.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-532v-xpq5-8h95/GHSA-532v-xpq5-8h95.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}