CVE-2026-34776
CVE-2026-34776 · Electron: Out-of-bounds read in second-instance IPC on macOS and Linux
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 5.3 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
electron
- Versions
- < 38.8.6: Affected
- >= 39.0.0-alpha.1, < 39.8.1: Affected
- >= 40.0.0-alpha.1, < 40.8.1: Affected
- >= 41.0.0-alpha.1, < 41.0.0: Affected
No fix published
electron npm
- Affected ranges
- SEMVER: < 38.8.6
Update to 38.8.6
electron npm
- Affected ranges
- SEMVER: ≥ 39.0.0-alpha.1, < 39.8.1
Update to 39.8.1
electron npm
- Affected ranges
- SEMVER: ≥ 40.0.0-alpha.1, < 40.8.1
Update to 40.8.1
electron npm
- Affected ranges
- SEMVER: ≥ 41.0.0-alpha.1, < 41.0.0
Update to 41.0.0