CVE-2026-34774

The record

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 39.8.1, 40.7.0, and 41.0.0, apps that use offscreen rendering and allow child windows via window.open() may be vulnerable to a use-after-free. If the parent offscreen WebContents is destroyed while a child window remains open, subsequent paint frames on the child dereference freed memory, which may lead to a crash or memory corruption. Apps are only affected if they use offscreen rendering (webPreferences.offscreen: true) and their setWindowOpenHandler permits child windows. Apps that do not use offscreen rendering, or that deny child windows, are not affected. This issue has been patched in versions 39.8.1, 40.7.0, and 41.0.0.

Affected packages

Related vulnerabilities

• GHSA-532v-xpq5-8h95 Electron: Use-after-free in offscreen child window paint callback 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