Platform
nodejs
Component
electron
Fixed in
38.8.7
39.0.1
40.0.1
41.0.1
CVE-2026-34769 is a high-severity vulnerability affecting Electron applications. This issue stems from an undocumented commandLineSwitches webPreference that allows attackers to inject arbitrary command-line switches into the renderer process. This can potentially bypass renderer sandboxing and web security controls, leading to significant compromise. Affected versions include Electron 38.0.0 through 40.7.0, and 41.0.0-alpha.1 to 41.0.0-beta.8; a fix is available in Electron 38.8.6.
The primary impact of CVE-2026-34769 lies in the potential for attackers to bypass Electron's security sandbox. By injecting malicious command-line switches, an attacker could disable critical security features, allowing them to execute arbitrary code within the renderer process with elevated privileges. This could lead to data exfiltration, remote code execution, and complete compromise of the affected application and potentially the underlying system. The vulnerability is particularly concerning because it can be exploited through the construction of webPreferences from untrusted external sources, a common practice in Electron application development. This is akin to a configuration bypass, allowing attackers to manipulate the application's behavior without direct code injection.
CVE-2026-34769 was publicly disclosed on April 3, 2026. Its inclusion in the KEV catalog is pending. Currently, there are no publicly available proof-of-concept exploits, but the vulnerability's ease of exploitation and potential impact make it a likely target for attackers. The NVD entry was published on the same date as the public disclosure. Given the nature of the vulnerability, it is reasonable to expect that attackers will develop and deploy exploits in the near future.
Exploit Status
EPSS
0.02% (6% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-34769 is to upgrade to Electron version 38.8.6 or later. If upgrading is not immediately feasible, carefully review all code that constructs webPreferences objects, ensuring that no external or untrusted input is used without proper validation and allowlisting. Consider implementing a strict allowlist of permitted command-line switches to prevent unauthorized modifications. While a Web Application Firewall (WAF) is unlikely to directly address this vulnerability, it could potentially mitigate the impact if it can detect and block requests containing malicious command-line arguments. There are no specific Sigma or YARA rules available for this vulnerability at this time, but monitoring for unusual process executions within Electron renderer processes is recommended.
Update to a version of Electron 38.8.6 or later, 39.8.0 or later, 40.7.0 or later, or 41.0.0-beta.8 or later. Avoid constructing webPreferences from external or untrusted sources without an allowlist of permitted options.
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CVE-2026-34769 is a high-severity vulnerability in Electron where an undocumented commandLineSwitches webPreference allows attackers to inject arbitrary command-line switches, potentially bypassing security controls.
You are affected if you use Electron versions 38.0.0–>= 41.0.0-alpha.1, < 41.0.0-beta.8 and construct webPreferences from untrusted input without an allowlist.
Upgrade to Electron version 38.8.6 or later. Review and validate all code constructing webPreferences to prevent untrusted input.
While no public exploits are currently available, the vulnerability's potential impact makes it a likely target for attackers.
Refer to the Electron security advisories: [https://github.com/electron/electron/security/advisories](https://github.com/electron/electron/security/advisories)
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