MediumGHSA-xj5x-m3f3-5x3hCVE-2026-34778

Electron: Service worker can spoof executeJavaScript IPC replies

Published 3 Apr 2026 · Updated 6 Apr 2026

Affected packages

electronnpm
Affected
<38.8.6
Fixed in
38.8.6
Update to the fixed version for your release line, for example:npm install electron@38.8.6
electronnpm
Affected
>=39.0.0-alpha.1 <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 <40.8.1
Fixed in
40.8.1
Update to the fixed version for your release line, for example:npm install electron@40.8.1
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

A service worker running in a session could spoof reply messages on the internal IPC channel used by webContents.executeJavaScript() and related methods, causing the main-process promise to resolve with attacker-controlled data.

Apps are only affected if they have service workers registered and use the result of webContents.executeJavaScript() (or webFrameMain.executeJavaScript()) in security-sensitive decisions.

Workarounds

Do not trust the return value of webContents.executeJavaScript() for security decisions. Use dedicated, validated IPC channels for security-relevant communication with renderers.

Fixed Versions

  • 41.0.0
  • 40.8.1
  • 39.8.1
  • 38.8.6

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.