What’s Vulnerable › Vulnerabilities
CVE-2026-34776: Electron: Out-of-bounds read in second-instance IPC on macOS and Linux
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-04 · updated 2026-07-24
- Weakness: CWE-125
Description
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
- electron: before 38.8.6; from 39.0.0 before 39.8.1; from 40.0.0 before 40.8.1; 41.0.0-alpha1, 41.0.0-alpha2, 41.0.0-alpha3, 41.0.0-alpha4, 41.0.0-alpha5, 41.0.0-alpha6 (+8) — fixed in 38.8.6, 39.8.1, 40.8.1
How to fix
Upgrade to a fixed version: electron 38.8.6, 39.8.1, 40.8.1. Check the vendor advisory for mitigations.
References
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