CVE-2026-34776: Electronjs Electron

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

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 macOS and Linux, apps that call app.requestSingleInstanceLock() were vulnerable to an out-of-bounds heap read when parsing a crafted second-instance message. Leaked memory could be delivered to the app's second-instance event handler. This issue is limited to processes running as the same user as the Electron app. Apps that do not call app.requestSingleInstanceLock() are not affected. Windows is not affected by this issue. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.

Affected products

• Electronjs Electron: before 38.8.6 (fixed in 38.8.6); from 39.0.0, before 39.8.1 (fixed in 39.8.1); from 40.0.0, before 40.8.1 (fixed in 40.8.1); version 41.0.0 only

Published 2026-04-04. Last modified 2026-07-24.