Electron: Out-of-bounds read in second-instance IPC on macOS and Linux
Priority LOW 23CWE-125Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · Low
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00223 12th percentileScored 2026-11-07
Fix Partial electron (electron): 38.8.6, 39.8.1, 40.8.1 +1electron (npm): 38.8.6, 39.8.1, 40.8.1 +1Red Hat: 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| electron | electron | before 38.8.6; 39.0.0-alpha.1 to before 39.8.1; 40.0.0-alpha.1 to before 40.8.1; 41.0.0-alpha.1 to before 41.0.0 | 38.8.6, 39.8.1, 40.8.1, 41.0.0 | Patch available | CNA |
| — | electron (npm) | before 38.8.6 | 38.8.6 | Patch available | GHSA-3c8v-cfp5-9885 |
| — | electron (npm) | 39.0.0-alpha.1 to before 39.8.1 | 39.8.1 | Patch available | GHSA-3c8v-cfp5-9885 |
| — | electron (npm) | 40.0.0-alpha.1 to before 40.8.1 | 40.8.1 | Patch available | GHSA-3c8v-cfp5-9885 |
| — | electron (npm) | 41.0.0-alpha.1 to before 41.0.0 | 41.0.0 | Patch available | GHSA-3c8v-cfp5-9885 |
- electron Vendorelectron Affected before 38.8.6; 39.0.0-alpha.1 to before 39.8.1; 40.0.0-alpha.1 to before 40.8.1; 41.0.0-alpha.1 to before 41.0.0 Fixed in 38.8.6, 39.8.1, 40.8.1, 41.0.0 Patch available CNA
- electron (npm) Vendor— Affected before 38.8.6 Fixed in 38.8.6 Patch available GHSA-3c8v-cfp5-9885
- electron (npm) Vendor— Affected 39.0.0-alpha.1 to before 39.8.1 Fixed in 39.8.1 Patch available GHSA-3c8v-cfp5-9885
- electron (npm) Vendor— Affected 40.0.0-alpha.1 to before 40.8.1 Fixed in 40.8.1 Patch available GHSA-3c8v-cfp5-9885
- electron (npm) Vendor— Affected 41.0.0-alpha.1 to before 41.0.0 Fixed in 41.0.0 Patch available GHSA-3c8v-cfp5-9885
CPE configurations NVD · 15
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:* | before 38.8.6; 39.0.0 to before 39.8.1; 40.0.0 to before 40.8.1 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:alpha1:*:*:*:node.js:*:* | 41.0.0 alpha1 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:alpha2:*:*:*:node.js:*:* | 41.0.0 alpha2 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:alpha3:*:*:*:node.js:*:* | 41.0.0 alpha3 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:alpha4:*:*:*:node.js:*:* | 41.0.0 alpha4 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:alpha5:*:*:*:node.js:*:* | 41.0.0 alpha5 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:alpha6:*:*:*:node.js:*:* | 41.0.0 alpha6 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:beta1:*:*:*:node.js:*:* | 41.0.0 beta1 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:beta2:*:*:*:node.js:*:* | 41.0.0 beta2 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:beta3:*:*:*:node.js:*:* | 41.0.0 beta3 | Vulnerable | Electronjs |
- cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:* Versions before 38.8.6; 39.0.0 to before 39.8.1; 40.0.0 to before 40.8.1 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:alpha1:*:*:*:node.js:*:* Versions 41.0.0 alpha1 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:alpha2:*:*:*:node.js:*:* Versions 41.0.0 alpha2 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:alpha3:*:*:*:node.js:*:* Versions 41.0.0 alpha3 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:alpha4:*:*:*:node.js:*:* Versions 41.0.0 alpha4 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:alpha5:*:*:*:node.js:*:* Versions 41.0.0 alpha5 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:alpha6:*:*:*:node.js:*:* Versions 41.0.0 alpha6 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:beta1:*:*:*:node.js:*:* Versions 41.0.0 beta1 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:beta2:*:*:*:node.js:*:* Versions 41.0.0 beta2 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:beta3:*:*:*:node.js:*:* Versions 41.0.0 beta3 Vulnerable ·Electronjs
Show 5 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:electronjs:electron:41.0.0:beta4:*:*:*:node.js:*:* | 41.0.0 beta4 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:beta5:*:*:*:node.js:*:* | 41.0.0 beta5 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:beta6:*:*:*:node.js:*:* | 41.0.0 beta6 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:beta7:*:*:*:node.js:*:* | 41.0.0 beta7 | Vulnerable | Electronjs |
| cpe:2.3:a:electronjs:electron:41.0.0:beta8:*:*:*:node.js:*:* | 41.0.0 beta8 | Vulnerable | Electronjs |
- cpe:2.3:a:electronjs:electron:41.0.0:beta4:*:*:*:node.js:*:* Versions 41.0.0 beta4 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:beta5:*:*:*:node.js:*:* Versions 41.0.0 beta5 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:beta6:*:*:*:node.js:*:* Versions 41.0.0 beta6 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:beta7:*:*:*:node.js:*:* Versions 41.0.0 beta7 Vulnerable ·Electronjs
- cpe:2.3:a:electronjs:electron:41.0.0:beta8:*:*:*:node.js:*:* Versions 41.0.0 beta8 Vulnerable ·Electronjs
Remediation
- Fix · CNA electron (electron) Fixed in 38.8.6, 39.8.1, 40.8.1, 41.0.0
- Fix · GHSA-3c8v-cfp5-9885 electron (npm) Fixed in 38.8.6 Advisory →
- Fix · GHSA-3c8v-cfp5-9885 electron (npm) Fixed in 39.8.1 Advisory →
- Fix · GHSA-3c8v-cfp5-9885 electron (npm) Fixed in 40.8.1 Advisory →
- Fix · GHSA-3c8v-cfp5-9885 electron (npm) Fixed in 41.0.0 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Build of Podman Desktop | Affected | No fix yet: Fix deferred |
| Red Hat Build of Podman Desktop - Tech Preview | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-34776
- 2026-10-03 Alias added: GHSA-3c8v-cfp5-9885
References
More electron vulnerabilities
- TI-2026-39496 Information disclosure in electron-builder CVSS 4.0HIGH 8.2
- TI-2024-26621 Code Signing Bypass on Windows in electron-updater < 6.3.0-alpha.6 CVSS 3.1HIGH 7.5
- TI-2023-09452 Content-Secrity-Policy disabling eval not applied consistently in renderers with sandbox disabled in Electron CVSS 3.1CRITICAL 9.8
- TI-2026-39157 Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow CVSS 4.0CRITICAL 9.3
- TI-2017-09308 GitHub Electron before 1.6.8 allows remote command execution because of a nodeIntegration… CVSS 3.0HIGH 8.1
- TI-2022-11788 Exposure of Resource to Wrong Sphere in Electron CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-34776 · CVE Program
- CVE-2026-34776 · NVD
- FIRST EPSS
- GHSA-3c8v-cfp5-9885 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-34776 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences