HighGHSA-532v-xpq5-8h95CVE-2026-34774

Electron: Use-after-free in offscreen child window paint callback

Published 3 Apr 2026 · Updated 6 Apr 2026

Affected packages

electronnpm
Affected
<39.8.1
Fixed in
39.8.1
Update to the fixed version for your release line, for example:npm install electron@39.8.1
electronnpm
Affected
>=40.0.0-alpha.1 <40.7.0
Fixed in
40.7.0
Update to the fixed version for your release line, for example:npm install electron@40.7.0
electronnpm
Affected
>=41.0.0-alpha.1 <41.0.0
Fixed in
41.0.0
Update to the fixed version for your release line, for example:npm install electron@41.0.0

Details

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

  • 41.0.0
  • 40.7.0
  • 39.8.1

For more information

If there are any questions or comments about this advisory, please email [security@electronjs.org](mailto:security@electronjs.org)

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.