What is CVE-2026-34776?

CVE-2026-34776 is a medium-severity vulnerability in Electron, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2026-04-03.

How severe is CVE-2026-34776?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Out-of-bounds Read in Electron

CVE-2026-34776

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 vulnerabl…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (1.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L.

Affected products

Electron — versions < 38.8.6, >= 39.0.0-alpha.1, < 39.8.1, >= 40.0.0-alpha.1, < 40.8.1

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

https://github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-34776?: CVE-2026-34776 is a medium-severity vulnerability in Electron, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2026-04-03.
How severe is CVE-2026-34776?: Medium severity. CVSS v3 base score is 5.3 out of 10.