GHSA-3c8v-cfp5-9885
Electron: Out-of-bounds read in second-instance IPC on macOS and Linux
At a glance
- Published
- Updated
- CVE
- CVE-2026-34776
- CVSS_V3
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L
Description
### 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 [security@electronjs.org](mailto:security@electronjs.org)
Affected packages
| Package | Versions |
|---|---|
| npm · electron | introduced 0, fixed 38.8.6 |
| npm · electron | introduced 39.0.0-alpha.1, fixed 39.8.1 |
| npm · electron | introduced 40.0.0-alpha.1, fixed 40.8.1 |
| npm · electron | introduced 41.0.0-alpha.1, fixed 41.0.0 |
References
- https://github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-34776 ADVISORY
- https://github.com/electron/electron PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |