What’s Vulnerable › Vulnerabilities
CVE-2026-34767: Electron: HTTP Response Header Injection in custom protocol handlers and webRequest
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-04 · updated 2026-07-24
- Weakness: CWE-74
Description
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.3, 40.8.3, and 41.0.3, apps that register custom protocol handlers via protocol.handle() / protocol.registerSchemesAsPrivileged() or modify response headers via webRequest.onHeadersReceived may be vulnerable to HTTP response header injection if attacker-controlled input is reflected into a response header name or value. 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.
Affected products
- electron: before 38.8.6; from 39.0.0 before 39.8.3; from 40.0.0 before 40.8.3; from 41.0.0 before 41.0.3 — fixed in 38.8.6, 39.8.3, 40.8.3, 41.0.3
How to fix
Upgrade to a fixed version: electron 38.8.6, 39.8.3, 40.8.3, 41.0.3. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-34767 or the next vulnerability affects your stack