CVE-2026-34767Electron: HTTP Response Header Injection in custom protocol handlers and webRequest
Updated under an hour ago ()
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It affects electron and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N
- Weakness (CWE)
- CWE-74, CWE-113
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Apr 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
electron electron electron:electron (from the name) | before 38.8.6; from 39.0.0-alpha.1, < 39.8.3; from 40.0.0-alpha.1, < 40.8.3; from 41.0.0-alpha.1, < 41.0.3 | CNA record |
electronjs electron electronjs: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 | NVD |
References
- https://github.com/electron/electron/security/advisories/GHSA-4p4r-m79c-wq3vx-refsource-confirm, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.