Electron 43.4.1

Overview

Electron 43.4.1 is a patch release for the stable 43 series, published on August 19, 2026. This maintenance update contains two focused fixes and no new APIs, making it a low-risk upgrade for developers already on Electron 43.

Fixes

• DevTools in custom windows: Fixed DevTools popup and context menus not appearing when DevTools is hosted in a custom window via webContents.setDevToolsWebContents().
• Protocol handler responses: Fixed registerFileProtocol and registerHttpProtocol returning readable responses to cross-origin no-cors fetches; they now return opaque responses to match the behavior of protocol.handle, closing a potential information leak.

Backport Coverage

Both fixes have also been backported to the maintenance branches — the DevTools menu fix applies to the 44 series, while the protocol-handler correction ships in the 41, 42, and 43 lines. Upgrading to 43.4.1 is recommended for applications that register custom protocols or host DevTools in their own windows.