CVE-2026-34773

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, on Windows, app.setAsDefaultProtocolClient(protocol) did not validate the protocol name before writing to the registry. Apps that pass untrusted input as the protocol name may allow an attacker to write to arbitrary subkeys under HKCU\Software\Classes\, potentially hijacking existing protocol handlers. Apps are only affected if they call app.setAsDefaultProtocolClient() with a protocol name derived from external or untrusted input. Apps that use a hardcoded protocol name are not affected. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.

Affected packages

Related vulnerabilities

• GHSA-mwmh-mq4g-g6gr Electron: Registry key path injection in app.setAsDefaultProtocolClient on Windows 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