CVE-2026-34770: Electron: Use-after-free in PowerMonitor on Windows and macOS
Impact Apps that use the powerMonitor module may be vulnerable to a use-after-free. After the native PowerMonitor object is garbage-collected, the associated OS-level resources (a message window on Windows, a shutdown handler on macOS) retain dangling references. A subsequent session-change event (Windows) or system shutdown (macOS) dereferences freed memory, which may lead to a crash or memory corruption.
All apps that access powerMonitor events (suspend, resume, lock-screen, etc.) are potentially affected. The issue is not directly renderer-controllable.
Workarounds There are no app side workarounds, you must update to a patched version of Electron.
Fixed Versions 41.0.0-beta.8 40.8.0 39.8.1 38.8.6
For more information If there are any questions or comments about this advisory, please email security@electronjs.org
Other sources
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.0, and 41.0.0-beta.8, apps that use the powerMonitor module may be vulnerable to a use-after-free. After the native PowerMonitor object is garbage-collected, the associated OS-level resources (a message window on Windows, a shutdown handler on macOS) retain dangling references. A subsequent session-change event (Windows) or system shutdown (macOS) dereferences freed memory, which may lead to a crash or memory corruption. All apps that access powerMonitor events (suspend, resume, lock-screen, etc.) are potentially affected. The issue is not directly renderer-controllable. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.0, and 41.0.0-beta.8.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 41.0.0-beta.8 - Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 40.8.0 - Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 39.8.1 - Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 38.8.6 - Upgrade
Upgrade
Electron (powerMonitor use-after-free)to a version that resolves this vulnerability.Fixed in 38.8.6 - Upgrade
Upgrade
Electron (powerMonitor use-after-free)to a version that resolves this vulnerability.Fixed in 39.8.1 - Upgrade
Upgrade
Electron (powerMonitor use-after-free)to a version that resolves this vulnerability.Fixed in 40.8.0 - Upgrade
Upgrade
Electron (powerMonitor use-after-free)to a version that resolves this vulnerability.Fixed in 41.0.0-beta.8