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GHSA-ff2p-hmqr-hxm4 CVE-2026-70610

Electron: contextBridge object copy honors prototype setters

Medium npm
Severity
5.4 / 10
Medium · CVSS 3.1
Exploit chance (EPSS)
0.56%
Chance of exploitation in the next 30 days. Higher than 46.86% of scored vulnerabilities.
Known exploited
No
Not in CISA's catalog
Weakness
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Fix
39.8.9
Upgrade electron to this version or later

Description

Impact

Objects copied across the contextBridge boundary from untrusted content could carry an attacker-influenced prototype, enabling prototype-pollution-style attacks against preload code despite context isolation being enabled.

Apps are only affected if their preload code accepts object arguments from untrusted content and reads properties from them without own-property checks. Apps that only accept primitive arguments, or that validate object arguments, are not affected.

Workarounds

Validate objects received from untrusted content with own-property checks (Object.hasOwn), or copy them onto a null-prototype object before use.

Fixed Versions

  • 42.0.0-beta.4
  • 41.2.2
  • 40.9.2
  • 39.8.9

For more information

If you have any questions or comments about this advisory, email Electron at security@electronjs.org

Affected versions

npm

PackageVulnerableFixed in
electron
< 39.8.9
39.8.9
electron
>= 40.0.0-alpha.1, < 40.9.2
40.9.2
electron
>= 41.0.0-alpha.1, < 41.2.2
41.2.2
electron
>= 42.0.0-alpha.1, < 42.0.0-beta.4
42.0.0-beta.4

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

electron npm → 39.8.9

npm
npm install electron@39.8.9
yarn
yarn add electron@39.8.9
pnpm
pnpm add electron@39.8.9

Severity breakdown

CVSS 3.1 5.4

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Weakness

CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

How to prevent it
  • Implementation: By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.
  • Architecture and Design: By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.
  • Implementation: When handling untrusted objects, validating using a schema can be used.
  • Implementation: By using an object without prototypes (via Object.create(null) ), adding object prototype attributes by accessing the prototype via the special attributes becomes impossible, mitigating this weakness.
  • Implementation: Map can be used instead of objects in most cases. If Map methods are used instead of object attributes, it is not possible to access the object prototype or modify it.

References

Packages

Other links

Timeline

  1. Published
  2. Last updated by the source
  3. Latest EPSS score
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