github.com
https://github.com/electron/electron CVE-2026-34776
MEDIUM
Electron: Out-of-bounds read in second-instance IPC on macOS and Linux
Record summary
CVE-2026-34776 has a selected CVSS score of 5.3 (medium).
Description
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, 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. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Apr 6, 2026 · Source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
electronBrowse electron / electron | CVE List | < 38.8.6 | affected |
| >= 39.0.0-alpha.1, < 39.8.1 | affected | ||
| >= 40.0.0-alpha.1, < 40.8.1 | affected | ||
| >= 41.0.0-alpha.1, < 41.0.0 | affected | ||
electronBrowse npm / electron | GitHub Advisory | Before 38.8.6 · Fixed in 38.8.6 | affected |
| 39.0.0-alpha.1 to < 39.8.1 · Fixed in 39.8.1 | affected | ||
| 40.0.0-alpha.1 to < 40.8.1 · Fixed in 40.8.1 | affected | ||
| 41.0.0-alpha.1 to < 41.0.0 · Fixed in 41.0.0 | affected |
References
3github.comConfirmation
https://github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885 nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-34776