CVE-2026-70601

Electron: Context isolation bypass via Function.prototype.bind hijack

HIGH

7.5

CVSS Score

Published: August 5, 2026 at 03:45 PM UTC

Updated: October 8, 2026 at 01:54 PM UTC

2 products affected across 2 vendorsElectronElectron

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Severity

HIGH7.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.5, apps that expose Promise-returning functions to web content via contextBridge may be vulnerable to a context isolation bypass. Untrusted web content could obtain access to the isolated preload world and, through it, every capability the preload script has. In renderers without a sandbox, or with nodeIntegration enabled, this may escalate to Node.js access. Apps are affected if they expose Promise-returning functions via contextBridge, the standard pattern for wrapping ipcRenderer.invoke, in windows that load untrusted content. This issue is fixed in versions 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.5.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Electron · Electronjsnpm

95%

v < 39.8.940.0.0 ≤ v < 40.9.241.0.0 ≤ v < 41.2.2*42.0.0 42.0.0 alpha1 42.0.0 alpha2 42.0.0 alpha3 42.0.0 alpha4 42.0.0 alpha5 42.0.0 alpha6 42.0.0 beta1 42.0.0 beta2 42.0.0 beta3 42.0.0 beta4

Affected range stops below 39.8.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 40.9.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 41.2.2, so it looks safe — our inference, not a vendor statement

Electron · Electron

90%

v < 39.8.9>= 40.0.0-alpha.1, < 40.9.2>= 41.0.0-alpha.1, < 41.2.2>= 42.0.0-alpha.1, < 42.0.0-beta.5

Affected range stops below 39.8.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 40.9.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 41.2.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 42.0.0-beta.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/electron/electron/security/advisories/GHSA-h7rp-cf8h-j98x

References (1)

x_refsource_CONFIRMVendor Advisory

Source: cverecord

https://github.com/electron/electron/security/advisories/GHSA-h7rp-cf8h-j98x

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: CHANGED
Confidentiality: HIGH
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-693

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