CVE-2026-34776

mediumpriority · track · 21EPSS 0.002 · 13 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.23% (13th) EPSS

CVSS 5.3 · medium

Is it mine?

12 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-23

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Lsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Lsecondary · security-advisories@github.comexploitability 1 · impact 4.2

v3.15.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Lsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USCWE-125US

affected products (12)

Products and version ranges known to be affected.

Electron Electron≤ < 38.8.6enisa_euvdEU
Electron Electron39.0.0-alpha.1, → 39.8.1enisa_euvdEU
Electron Electron40.0.0-alpha.1, → 40.8.1enisa_euvdEU
Electron Electron41.0.0-alpha.1, → 41.0.0enisa_euvdEU
electronjs electron< 38.8.6nvdUScpe:2.3:a:electronjs:electron:*:*:*:*:*:*:*:*
electronjs electron39.0.0 → 39.8.1nvdUScpe:2.3:a:electronjs:electron:*:*:*:*:*:*:*:*
electronjs electron40.0.0 → 40.8.1nvdUScpe:2.3:a:electronjs:electron:*:*:*:*:*:*:*:*
electronjs electron= 41.0.0nvdUScpe:2.3:a:electronjs:electron:*:*:*:*:*:*:*:*
npm electron< 38.8.6osvUSpkg:npm/electron
npm electron39.0.0-alpha.1 → 39.8.1osvUSpkg:npm/electron
npm electron40.0.0-alpha.1 → 40.8.1osvUSpkg:npm/electron
npm electron41.0.0-alpha.1 → 41.0.0osvUSpkg:npm/electron

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-3c8v-cfp5-9885Electron: Out-of-bounds read in second-instance IPC on macOS and Linux2026-04-03ghsa · osvUS
### 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)

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2026-04-04modified 2026-07-24

references (4)

External citations — patches, advisories, analysis.

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