CVE-2026-34778 Electron: Service worker can spoof executeJavaScript IPC replies
Service workers can spoof IPC replies in Electron, allowing attackers to manipulate security-sensitive decisions made by the main process.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34778?
CVE-2026-34778 is a medium-severity vulnerability in Electronjs Electron, published on 3 Apr 2026. Any signed-in user can exploit it over the 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, a service worker running in a session could spoof reply messages on the internal IPC channel used by webContents.executeJavaScript() and related methods, causing the main-process promise to resolve with attacker-controlled data. Apps are only affected if they have service workers registered and use the result of webContents.executeJavaScript() (or webFrameMain.executeJavaScript()) in security-sensitive decisions. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.
Which versions are affected by CVE-2026-34778?
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-2026-34778?
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-2026-34778 being exploited?
There is no known exploitation of CVE-2026-34778 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-xj5x-m3f3-5x3h.