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CVE-2026-34774— Electron: Use-after-free in offscreen child window paint callback

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 39.8.1之前版本、40.7.0之前版本和41.0.0之前版本存在资源管理错误漏洞，该漏洞源于使用离屏渲染并允许通过window.open创建子窗口时存在释放后重用问题，可能导致崩溃或内存损坏。

CVSS 8.1 · High EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 3

VendorProduct Version RangeStatus
electron electron < 39.8.1 affected
>= 40.0.0-alpha.1, < 40.7.0 affected
>= 41.0.0-alpha.1, < 41.0.0 affected
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I. Basic Information for CVE-2026-34774

Vulnerability Information
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Vulnerability Title
Electron: Use-after-free in offscreen child window paint callback
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 39.8.1, 40.7.0, and 41.0.0, apps that use offscreen rendering and allow child windows via window.open() may be vulnerable to a use-after-free. If the parent offscreen WebContents is destroyed while a child window remains open, subsequent paint frames on the child dereference freed memory, which may lead to a crash or memory corruption. Apps are only affected if they use offscreen rendering (webPreferences.offscreen: true) and their setWindowOpenHandler permits child windows. Apps that do not use offscreen rendering, or that deny child windows, are not affected. This issue has been patched in versions 39.8.1, 40.7.0, and 41.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Electron 资源管理错误漏洞
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 39.8.1之前版本、40.7.0之前版本和41.0.0之前版本存在资源管理错误漏洞，该漏洞源于使用离屏渲染并允许通过window.open创建子窗口时存在释放后重用问题，可能导致崩溃或内存损坏。
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 < 39.8.1 -

II. Public POCs for CVE-2026-34774

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III. Intelligence Information for CVE-2026-34774

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Vendor Advisories for CVE-2026-34774 (1)

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

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-2026-34776 5.3 MEDIUM Electron: Out-of-bounds read in second-instance IPC on macOS and Linux
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-416

V. Comments for CVE-2026-34774

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