Vulnerability · Published Apr 3, 2026 · Assigned by GitHub_M
CVE-2026-34767Electron: HTTP Response Header Injection in custom protocol handlers and webRequest
Medium 5.9
In plain English
A medium-severity injection in electron from electron. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | electron | 38.8.6 | GHSA-4p4r-m79c-wq3v |
| npm | electron | 39.8.3 | GHSA-4p4r-m79c-wq3v |
| npm | electron | 40.8.3 | GHSA-4p4r-m79c-wq3v |
| npm | electron | 41.0.3 | GHSA-4p4r-m79c-wq3v |
Affected products (as reported)
Weakness: CWE-74, CWE-113 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N
References
- https://github.com/electron/electron/security/advisories/GHSA-4p4r-m79c-wq3v x_refsource_CONFIRM