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GHSA-3c8v-cfp5-9885

Electron: Out-of-bounds read in second-instance IPC on macOS and Linux

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-34776

Packages

EcosystemPackageAffectedFixed in
npm electron < 38.8.6 38.8.6
npm electron >= 39.0.0-alpha.1, < 39.8.1 39.8.1
npm electron >= 40.0.0-alpha.1, < 40.8.1 40.8.1
npm electron >= 41.0.0-alpha.1, < 41.0.0 41.0.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact 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. ### Workarounds There are no app side workarounds, developers must update to a patched version of Electron. ### 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 [[email protected]](mailto:[email protected])

References

External links from the advisory. They lead to third-party sites.