CVE-2026-34767 Electron: HTTP Response Header Injection in custom protocol handlers and webRequest
Attackers can inject HTTP response headers in Electron apps using custom protocols or webRequest, potentially bypassing security controls like CSP or cookies.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-34767?
CVE-2026-34767 is a medium-severity vulnerability in Electronjs Electron, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-34767?
8 open source packages ship an affected version, including electron. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
electron npm | All versions | 38.8.6 |
electron npm | All versions | 38.8.6 |
electron npm | From 39.0.0-alpha.1 | 39.8.3 |
electron npm | From 39.0.0-alpha.1 | 39.8.3 |
electron npm | From 40.0.0-alpha.1 | 40.8.3 |
electron npm | From 40.0.0-alpha.1 | 40.8.3 |
2 more packages
electron npm | From 41.0.0-alpha.1 | 41.0.3 |
electron npm | From 41.0.0-alpha.1 | 41.0.3 |
Products include Electronjs Electron.
How do I fix CVE-2026-34767?
Upgrade electron to a fixed version for your release line: 38.8.6, 39.8.3, 40.8.3 or 41.0.3.
Is CVE-2026-34767 being exploited?
There is no known exploitation of CVE-2026-34767 in the wild and no public exploit code.
Other vulnerabilities in Electronjs Electron
- CVE-2017-16151 Chromium Remote Code Execution in electron
- CVE-2018-1000118 Electron protocol handler browser vulnerable to Command Injection
- CVE-2026-34780 Electron: Context Isolation bypass via contextBridge VideoFrame transfer
- CVE-2026-102676 Electron: <webview> can enable Node.js integration in Web Workers despite embedder restrictions
- CVE-2026-102673 Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab
Sources
Also known as GHSA-4p4r-m79c-wq3v.