CVE-2026-34778
Medium · 5.9CVSS
5.9
EPSS
0.1%
Published
Apr 4, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | electron | 0 | 38.8.6 |
| npm | electron | 39.0.0-alpha.1 | 39.8.1 |
| npm | electron | 40.0.0-alpha.1 | 40.8.1 |
| npm | electron | 41.0.0-alpha.1 | 41.0.0 |
Related vulnerabilities
- GHSA-xj5x-m3f3-5x3h Electron: Service worker can spoof executeJavaScript IPC replies Same vulnerability
- CVE-2026-54257 Electron is a framework for writing cross-platform desktop applications using JavaScript… Also affects electron
- GHSA-q6m5-f73j-m9mc Electron: Buffer performs incorrect byte length calculations resulting in heap buffer… Also affects electron
- CVE-2026-34781 Electron is a framework for writing cross-platform desktop applications using JavaScript… Also affects electron
- CVE-2026-34765 Electron is a framework for writing cross-platform desktop applications using JavaScript… Also affects electron
- GHSA-f37v-82c4-4x64 Electron: Crash in clipboard.readImage() on malformed clipboard image data Also affects electron
- GHSA-f3pv-wv63-48x8 Electron: Named window.open targets not scoped to the opener's browsing context Also affects electron
- CVE-2026-34764 Electron is a framework for writing cross-platform desktop applications using JavaScript… Also affects electron