CVE-2026-34767 electron CVE debrief

Who should care

Developers and administrators using Electron for cross-platform desktop applications should be aware of this vulnerability and take steps to mitigate it. This includes updating to the patched versions of Electron and reviewing their applications for potential vulnerabilities.

Technical summary

The vulnerability exists in the protocol.handle() and protocol.registerSchemesAsPrivileged() functions, as well as the webRequest.onHeadersReceived function. An attacker who can influence a header value may be able to inject additional response headers, affecting cookies, content security policy, or cross-origin access controls. Apps that do not reflect external input into response headers are not affected. This issue has been patched in versions 38.8.6, 39.8.3, 40.8.3, and 41.0.3.

Defensive priority

Medium

Recommended defensive actions

• Update to Electron version 38.8.6, 39.8.3, 40.8.3, or 41.0.3 or later
• Review applications for potential vulnerabilities
• Implement additional security measures to prevent header injection
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record was published on 2026-04-04T00:16:17.337Z and was last modified on 2026-07-24T22:10:00.140Z. The NVD entry is currently Analyzed. This vulnerability affects Electron versions prior to 38.8.6, 39.8.3, 40.8.3, and 41.0.3. Developers should verify their applications for potential vulnerabilities and update to the patched versions. The CVE record provides additional details on the vulnerability, including its CVSS score and severity.

Official resources