Electron: contextBridge object copy honors prototype setters

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-70610
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-05 18:17:15 UTC
Updated2026-10-08 13:53:12 UTC
DescriptionElectron 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.4, 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, while apps that only accept primitive arguments or validate object arguments are not affected. This issue is fixed in 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.4.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

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

EPSS: 0.004790000 probability, percentile 0.397120000 (date 2026-09-08)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Electronjs Electron All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Electron Electron affected < 39.8.9 Not specified
CNA Electron Electron affected >= 40.0.0-alpha.1, < 40.9.2 Not specified
CNA Electron Electron affected >= 41.0.0-alpha.1, < 41.2.2 Not specified
CNA Electron Electron affected >= 42.0.0-alpha.1, < 42.0.0-beta.4 Not specified

References

ReferenceSourceLinkTags
github.com/electron/electron/releases/tag/v40.9.2 [email protected] github.com Release Notes
github.com/electron/electron/releases/tag/v39.8.9 [email protected] github.com Release Notes
github.com/electron/electron/commit/5b699544cbbed51bedb7c60d75c8c42be582... [email protected] github.com Patch
github.com/electron/electron/commit/4ac50292d552fb510eb778392620c8530877... [email protected] github.com Patch
github.com/electron/electron/pull/51083 [email protected] github.com Issue Tracking, Patch
github.com/electron/electron/pull/51086 [email protected] github.com Issue Tracking, Patch
github.com/electron/electron/commit/23a6efb714dec80e2cf45d3054d18d701162... [email protected] github.com Patch
github.com/electron/electron/pull/51084 [email protected] github.com Issue Tracking, Patch
github.com/electron/electron/security/advisories/GHSA-ff2p-hmqr-hxm4 [email protected] github.com Vendor Advisory, Mitigation
github.com/electron/electron/pull/51085 [email protected] github.com Issue Tracking, Patch
github.com/electron/electron/releases/tag/v42.0.0-beta.4 [email protected] github.com Release Notes
github.com/electron/electron/releases/tag/v41.2.2 [email protected] github.com Release Notes
github.com/electron/electron/commit/17d5d26499cd279fab48f5f26527f8edc02a... [email protected] github.com Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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