{"id":"CVE-2026-34771","aliases":["GHSA-8337-3p73-46f4"],"url":"https://o3.security/vulnerability/CVE-2026-34771","summary":"Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permission callbacks","details":"### Impact\nApps that register an asynchronous `session.setPermissionRequestHandler()` may be vulnerable to a use-after-free when handling fullscreen, pointer-lock, or keyboard-lock permission requests. If the requesting frame navigates or the window closes while the permission handler is pending, invoking the stored callback dereferences freed memory, which may lead to a crash or memory corruption.\n\nApps that do not set a permission request handler, or whose handler responds synchronously, are not affected.\n\n### Workarounds\nRespond to permission requests synchronously, or deny fullscreen, pointer-lock, and keyboard-lock requests if an asynchronous flow is required.\n\n### Fixed Versions\n* `41.0.0-beta.8`\n* `40.7.0`\n* `39.8.0`\n* `38.8.6`\n\n### For more information\nIf there are any questions or comments about this advisory, please email [security@electronjs.org](mailto:security@electronjs.org)","published":"2026-04-03T23:47:23.171Z","modified":"2026-08-12T15:33:39.963789Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"electron","fixedVersion":"38.8.6"},{"ecosystem":"npm","name":"electron","fixedVersion":"39.8.0"},{"ecosystem":"npm","name":"electron","fixedVersion":"40.7.0"},{"ecosystem":"npm","name":"electron","fixedVersion":"41.0.0-beta.8"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34771.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-34771"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34771.json"},{"type":"ADVISORY","url":"https://github.com/electron/electron/security/advisories/GHSA-8337-3p73-46f4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34771"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2454995"},{"type":"PACKAGE","url":"https://github.com/electron/electron"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T15:33:39.963789Z"}}