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CVE-2026-34776Electron: Out-of-bounds read in second-instance IPC on macOS and Linux

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.

Timeline

  1. ID reserved

    By GitHub_M

  2. · 4 days later

    Published

  3. · 3 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-34776, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1Medium5.3CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L
NVDNVD · Analyzed3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (exploitation in 30 days)
0.22% · top 87% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Affected products

  • electron · electron

    • affected < 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 packages

From reviewed advisories of the GitHub Advisory Database.

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-34776 badge
[![CVE-2026-34776](https://cveledger.app/badge/CVE-2026-34776.svg)](https://cveledger.app/cve/CVE-2026-34776)

Record last updated .