Microsoft CVE-2026-34774
HIGH
GHSA-532v-xpq5-8h95
CVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionNVD
Impact
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.
Workarounds
Deny child window creation from offscreen renderers in your setWindowOpenHandler, or ensure child windows are closed before the parent is destroyed.
Fixed Versions
41.0.040.7.039.8.1
For more information
If there are any questions or comments about this advisory, please email [security@electronjs.org](mailto:security@electronjs.org)
AnalysisAI
Use-after-free memory corruption in Electron framework (versions <39.8.1, <40.7.0, <41.0.0) allows unauthenticated remote attackers to potentially execute arbitrary code when offscreen rendering is enabled and child windows are permitted. The vulnerability triggers when a parent offscreen WebContents is destroyed while child windows remain active, causing subsequent paint operations to dereference freed memory. …
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RemediationAI
Within 24 hours: identify all Electron-based applications in your environment and determine current framework versions. Within 7 days: upgrade to patched versions (Electron 39.8.1 or later, 40.7.0 or later, or 41.0.0 or later) and test in staging environments. …
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