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CVE-2026-34776— Electron: Out-of-bounds read in second-instance IPC on macOS and Linux

Quick assessment

Affected
electron electron
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Electron是Electron开源的一个用户编写跨平台桌面应用的 JavaScript 框架。该框架基于 nodejs 和 Chromium 可以使用HTML，CSS实现跨平台桌面应用的编写。 Electron 38.8.6之前版本、39.8.1之前版本、40.8.1之前版本和41.0.0之前版本存在缓冲区错误漏洞，该漏洞源于在macOS和Linux上调用app.requestSingleInstanceLock时解析特制的第二个实例消息存在越界堆读取问题，可能导致内存泄露。

CVSS 5.3 · Medium EPSS 0.23% · P13
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I. Basic Information for CVE-2026-34776

Vulnerability Information
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Vulnerability Title
Electron: Out-of-bounds read in second-instance IPC on macOS and Linux
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Electron 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Electron是Electron开源的一个用户编写跨平台桌面应用的 JavaScript 框架。该框架基于 nodejs 和 Chromium 可以使用HTML，CSS实现跨平台桌面应用的编写。 Electron 38.8.6之前版本、39.8.1之前版本、40.8.1之前版本和41.0.0之前版本存在缓冲区错误漏洞，该漏洞源于在macOS和Linux上调用app.requestSingleInstanceLock时解析特制的第二个实例消息存在越界堆读取问题，可能导致内存泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
electron electron < 38.8.6 -

II. Public POCs for CVE-2026-34776

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III. Intelligence Information for CVE-2026-34776

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Vendor Advisories for CVE-2026-34776 (1)

Same Patch Batch · electron · 2026-04-03 · 13 CVEs total

CVE-2026-34774 8.1 HIGH Electron: Use-after-free in offscreen child window paint callback
CVE-2026-34769 7.8 HIGH Electron: Renderer command-line switch injection via undocumented commandLineSwitches webP
CVE-2026-34771 7.5 HIGH Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permis
CVE-2026-34770 7.0 HIGH Electron: Use-after-free in PowerMonitor on Windows and macOS
CVE-2026-34775 6.8 MEDIUM Electron: nodeIntegrationInWorker not correctly scoped in shared renderer processes
CVE-2026-34767 5.9 MEDIUM Electron: HTTP Response Header Injection in custom protocol handlers and webRequest
CVE-2026-34778 5.9 MEDIUM Electron: Service worker can spoof executeJavaScript IPC replies
CVE-2026-34772 5.8 MEDIUM Electron: Use-after-free in download save dialog callback
CVE-2026-34777 5.4 MEDIUM Electron: Incorrect origin passed to permission request handler for iframe requests
CVE-2026-34773 4.7 MEDIUM Electron: Registry key path injection in app.setAsDefaultProtocolClient on Windows
CVE-2026-34768 3.9 LOW Electron: Unquoted executable path in app.setLoginItemSettings on Windows
CVE-2026-34766 3.3 LOW Electron: USB device selection not validated against filtered device list

IV. Related Vulnerabilities

Same product: electron
Same vendor: electron
Same weakness: CWE-125

V. Comments for CVE-2026-34776

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