CVE-2026-34774 Electron: Use-after-free in offscreen child window paint callback
Electron apps using offscreen rendering and child windows are vulnerable to use-after-free, potentially allowing code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34774?
CVE-2026-34774 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, with no action from the victim.
Official description
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 39.8.1, 40.7.0, and 41.0.0, apps 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. Apps 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. This issue has been patched in versions 39.8.1, 40.7.0, and 41.0.0.
Which versions are affected by CVE-2026-34774?
6 open source packages ship an affected version, including electron. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
electron npm | All versions | 39.8.1 |
electron npm | All versions | 39.8.1 |
electron npm | From 40.0.0-alpha.1 | 40.7.0 |
electron npm | From 40.0.0-alpha.1 | 40.7.0 |
electron npm | From 41.0.0-alpha.1 | 41.0.0 |
electron npm | From 41.0.0-alpha.1 | 41.0.0 |
Products include Electronjs Electron.
How do I fix CVE-2026-34774?
Upgrade electron to a fixed version for your release line: 39.8.1, 40.7.0 or 41.0.0.
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-2026-34774 being exploited?
There is no known exploitation of CVE-2026-34774 in the wild and no public exploit code.
Other vulnerabilities in Electronjs Electron
- CVE-2017-16151 Chromium Remote Code Execution in electron
- 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-532v-xpq5-8h95.