CVE-2026-34771 Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permission callbacks
Electron apps with asynchronous permission handlers may crash or allow code execution via use-after-free during permission requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-34771?
CVE-2026-34771 is a high-severity use after free vulnerability in Electronjs Electron, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8, 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. This issue has been patched in versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8.
Which versions are affected by CVE-2026-34771?
8 open source packages ship an affected version, including electron. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
electron npm | All versions | 38.8.6 |
electron npm | All versions | 38.8.6 |
electron npm | From 39.0.0-alpha.1 | 39.8.0 |
electron npm | From 39.0.0-alpha.1 | 39.8.0 |
electron npm | From 40.0.0-alpha.1 | 40.7.0 |
electron npm | From 40.0.0-alpha.1 | 40.7.0 |
2 more packages
electron npm | From 41.0.0-alpha.1 | 41.0.0-beta.8 |
electron npm | From 41.0.0-alpha.1 | 41.0.0-beta.8 |
Products include Electronjs Electron.
How do I fix CVE-2026-34771?
Upgrade electron to a fixed version for your release line: 38.8.6, 39.8.0, 40.7.0 or 41.0.0-beta.8.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-34771 being exploited?
There is no known exploitation of CVE-2026-34771 in the wild and no public exploit code.
Other vulnerabilities in Electronjs Electron
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- CVE-2018-1000118 Electron protocol handler browser vulnerable to Command Injection
- CVE-2026-34780 Electron: Context Isolation bypass via contextBridge VideoFrame transfer
- CVE-2026-102676 Electron: <webview> can enable Node.js integration in Web Workers despite embedder restrictions
- CVE-2026-102673 Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab
Sources
Also known as GHSA-8337-3p73-46f4.