CVE-2026-34771
HIGH
GHSA-8337-3p73-46f4
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
### Impact Apps 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. Apps that do not set a permission request handler, or whose handler responds synchronously, are not affected. ### Workarounds Respond to permission requests synchronously, or deny fullscreen, pointer-lock, and keyboard-lock requests if an asynchronous flow is required. ### Fixed Versions * `41.0.0-beta.8` * `40.7.0` * `39.8.0` * `38.8.6` ### For more information If there are any questions or comments about this advisory, please email [[email protected]](mailto:[email protected])
Analysis
Use-after-free in Electron framework allows memory corruption when handling fullscreen, pointer-lock, or keyboard-lock permission requests in apps with asynchronous `session.setPermissionRequestHandler()` callbacks. Affects npm package electron versions prior to 41.0.0-beta.8, 40.7.0, 39.8.0, and 38.8.6. …
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Remediation
Within 24 hours: Identify all internal and third-party applications built with Electron and document their current versions. Within 7 days: Upgrade Electron to patched versions (41.0.0-beta.8 or later for v41, 40.7.0+ for v40, 39.8.0+ for v39, 38.8.6+ for v38); prioritize applications exposed to untrusted remote content. …
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External POC / Exploit Code
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