CVE-2026-34774

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 products

Electron

Electronjs Electron

< 39.8.1, 40.7.0, 41.0.0

Fix

Available

CVSS 3.1

8.1 HIGH

EPSS

0.4% (37th percentile)

Weakness

CWE-825, CWE-416

NVD status

Modified

Published

2026-04-03

No exploit for CVE-2026-34774 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.