CVE-2026-34776 Details
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.
A vulnerability allowing an out-of-bounds heap read has been identified in Electron applications on macOS and Linux. This issue affects apps that call 'app.requestSingleInstanceLock()' and involves parsing a crafted second-instance message, which can lead to memory leakage that is delivered to the app's second-instance event handler. The vulnerability is confined to processes running under the same user as the Electron app. Notably, Windows applications are not impacted. The vulnerability exists in Electron versions prior to 38.8.6, versions 39.0.0-alpha.1 through 39.8.0, versions 40.0.0-alpha.1 through 40.8.0, and versions 41.0.0-alpha.1 through 41.0.0.
Users must update to Electron versions 38.8.6, 39.8.1, 40.8.1, or 41.0.0.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 6, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| electronjs electron | < 38.8.6 >= 39.0.0, < 39.8.1 >= 40.0.0, < 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 41.0.0 beta1 41.0.0 beta2 41.0.0 beta3 41.0.0 beta4 41.0.0 beta5 41.0.0 beta6 41.0.0 beta7 41.0.0 beta8 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 27, 2026 | Initial Analysis | [email protected] |
| Apr 4, 2026 | New CVE Received | [email protected] |