CVE-2026-34775 Overview
CVE-2026-34775 is an Improper Access Control vulnerability in Electron, the popular framework for building cross-platform desktop applications using JavaScript, HTML, and CSS. The vulnerability affects the nodeIntegrationInWorker webPreference, which was not correctly scoped in all configurations. In certain process-sharing scenarios, workers spawned in frames configured with nodeIntegrationInWorker: false could still receive Node.js integration, potentially allowing unauthorized access to Node.js APIs.
Critical Impact
Applications using Electron with nodeIntegrationInWorker enabled may inadvertently expose Node.js integration to workers in frames where it was explicitly disabled, potentially allowing attackers to access system-level APIs and execute arbitrary code in a privileged context.
Affected Products
- Electron versions prior to 38.8.6
- Electron versions prior to 39.8.4
- Electron versions prior to 40.8.4
- Electron versions prior to 41.0.0
Discovery Timeline
- 2026-04-04 - CVE-2026-34775 published to NVD
- 2026-04-07 - Last updated in NVD database
Technical Details for CVE-2026-34775
Vulnerability Analysis
This vulnerability stems from improper isolation of the nodeIntegrationInWorker webPreference setting across different process-sharing configurations in Electron applications. The core issue is classified under CWE-653 (Improper Isolation or Compartmentalization), which indicates a failure to properly separate different security contexts within the application.
When Electron applications enable nodeIntegrationInWorker for certain frames or contexts, the framework should ensure that this setting is properly scoped so that only the intended workers receive Node.js integration capabilities. However, due to this vulnerability, workers spawned in frames that were explicitly configured with nodeIntegrationInWorker: false could still inherit Node.js integration from other process-sharing scenarios.
This creates a significant security boundary violation where untrusted content loaded in what developers believed to be a sandboxed context could potentially access powerful Node.js APIs, including file system access, process spawning, and native module loading.
Root Cause
The root cause is improper scoping of the nodeIntegrationInWorker configuration option in Electron's process management layer. In process-sharing scenarios where multiple frames share underlying processes for performance optimization, the security preference was not correctly inherited or enforced on a per-frame basis. This allowed the Node.js integration setting from one context to leak into another context where it should have been disabled.
Attack Vector
An attacker could exploit this vulnerability by crafting malicious content that gets loaded into an Electron application's frame where nodeIntegrationInWorker was supposed to be disabled. If the application's process-sharing configuration allows the malicious frame to share a process with a frame that has Node.js integration enabled, the attacker's worker could gain access to Node.js APIs.
The attack requires user interaction (loading malicious content) and specific process-sharing conditions to be met, making exploitation conditional on application configuration and user behavior. If successfully exploited, the attacker could potentially read sensitive files, execute system commands, or escalate privileges within the application context.
Detection Methods for CVE-2026-34775
Indicators of Compromise
- Unexpected Node.js API calls originating from worker contexts in frames configured with nodeIntegrationInWorker: false
- Anomalous process spawning or file system access from Electron worker threads
- JavaScript errors or exceptions related to Node.js module loading in contexts where Node.js should be unavailable
Detection Strategies
- Monitor Electron application logs for unexpected Node.js API usage in worker contexts
- Implement content security policies (CSP) to restrict script execution and detect policy violations
- Use application-level auditing to track which contexts are spawning workers and their capabilities
Monitoring Recommendations
- Enable verbose logging in Electron applications to track webPreference configurations across frames
- Monitor for unusual network requests or file system access patterns from worker threads
- Implement runtime security checks to verify Node.js integration status in worker contexts
How to Mitigate CVE-2026-34775
Immediate Actions Required
- Update Electron to version 38.8.6, 39.8.4, 40.8.4, or 41.0.0 or later immediately
- Audit application code to identify all uses of nodeIntegrationInWorker webPreference
- Review process-sharing configurations and consider disabling process sharing for sensitive contexts
- If updates cannot be applied immediately, consider disabling nodeIntegrationInWorker entirely as a temporary measure
Patch Information
Security patches addressing this vulnerability have been released by the Electron team. The fixed versions are 38.8.6, 39.8.4, 40.8.4, and 41.0.0. Applications should be updated to one of these versions based on their current Electron major version. For detailed patch information, refer to the GitHub Security Advisory.
Workarounds
- Disable nodeIntegrationInWorker entirely if the feature is not strictly required for application functionality
- Avoid loading untrusted content in frames that share processes with frames requiring Node.js integration
- Implement additional application-level security checks to verify Node.js availability before performing sensitive operations
# Configuration example - Update Electron in package.json
npm update electron@latest
# Or specify a fixed version explicitly
npm install electron@41.0.0
# Verify the installed version
npx electron --version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
