CVE-2026-34776

MEDIUM

Electron: Out-of-bounds read in second-instance IPC on macOS and Linux

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 5.3
EPSS 0.0022
EPSS Percentile 12.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-125
Status published
Products (7)
electron/electron < 38.8.6
electron/electron >= 39.0.0-alpha.1, < 39.8.1
electron/electron >= 40.0.0-alpha.1, < 40.8.1
electron/electron >= 41.0.0-alpha.1, < 41.0.0
electronjs/electron 41.0.0 alpha1 (14 CPE variants)
electronjs/electron < 38.8.6
npm/electron 0 - 38.8.6npm
Published Apr 04, 2026
Tracked Since Apr 04, 2026