CVE-2026-34776 Electron: Out-of-bounds read in second-instance IPC on macOS and Linux
An out-of-bounds read in Electron's second-instance IPC allows local attackers to leak memory to the application's event handler.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34776?
CVE-2026-34776 is a medium-severity vulnerability in Electronjs Electron, published on 3 Apr 2026. It can only be exploited from the same machine or local network, 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 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on macOS and Linux, apps that call app.requestSingleInstanceLock() were vulnerable to an out-of-bounds heap read when parsing a crafted second-instance message. Leaked memory could be delivered to the app's second-instance event handler. This issue is limited to processes running as the same user as the Electron app. Apps that do not call app.requestSingleInstanceLock() are not affected. Windows is not affected by this issue. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.
Weakness: CWE-125
Which versions are affected by CVE-2026-34776?
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 | 39.8.1 |
electron npm | From 39.0.0-alpha.1 | 39.8.1 |
electron npm | From 40.0.0-alpha.1 | 40.8.1 |
electron npm | From 40.0.0-alpha.1 | 40.8.1 |
2 more packages
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-2026-34776?
Upgrade electron to a fixed version for your release line: 38.8.6, 39.8.1, 40.8.1 or 41.0.0.
Is CVE-2026-34776 being exploited?
There is no known exploitation of CVE-2026-34776 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-3c8v-cfp5-9885.