{"id":"CVE-2026-34767","aliases":["EUVD-2026-18933","GHSA-4p4r-m79c-wq3v"],"status":"published","title":"Electron: HTTP Response Header Injection in custom protocol handlers and webRequest","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.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00215,"percentile":0.12043,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-113","CWE-74"],"published":"2026-04-03T02:37:24Z","modified":"2026-10-28T10:49:34Z","fixes":[{"ecosystem":"npm","package":"electron","fixed_in":["38.8.6","39.8.3","40.8.3","41.0.3"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"electron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"38.8.6"}]}]},{"source":"ghsa","ecosystem":"npm","package":"electron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"39.0.0-alpha.1"},{"fixed":"39.8.3"}]}]},{"source":"ghsa","ecosystem":"npm","package":"electron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"40.0.0-alpha.1"},{"fixed":"40.8.3"}]}]},{"source":"ghsa","ecosystem":"npm","package":"electron","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"41.0.0-alpha.1"},{"fixed":"41.0.3"}]}]},{"source":"osv","ecosystem":"npm","package":"electron","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"38.8.6"}]}]},{"source":"osv","ecosystem":"npm","package":"electron","ranges":[{"type":"SEMVER","events":[{"introduced":"39.0.0-alpha.1"},{"fixed":"39.8.3"}]}]},{"source":"osv","ecosystem":"npm","package":"electron","ranges":[{"type":"SEMVER","events":[{"introduced":"40.0.0-alpha.1"},{"fixed":"40.8.3"}]}]},{"source":"osv","ecosystem":"npm","package":"electron","ranges":[{"type":"SEMVER","events":[{"introduced":"41.0.0-alpha.1"},{"fixed":"41.0.3"}]}]}],"products":[{"vendor":"electron","product":"electron"},{"vendor":"electronjs","product":"electron"}],"references":[{"url":"https://github.com/electron/electron/security/advisories/GHSA-4p4r-m79c-wq3v","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34767","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-4p4r-m79c-wq3v"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34767.json","tags":["advisory"]},{"url":"https://github.com/electron/electron","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-34767","title":"Electron: HTTP Response Header Injection in custom protocol handlers and webRequest","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.","status":"published","published":"2026-04-03T23:43:09.327Z","modified":"2026-04-06T19:07:57.198Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-74","CWE-113"],"updated_at":"2026-11-02T14:20:14.302133Z"}],"euvd":[{"id":"EUVD-2026-18933","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.","status":"published","published":"2026-04-03T23:43:09Z","modified":"2026-04-06T19:07:57Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T19:25:15.380284Z"}],"ghsa":[{"id":"GHSA-4p4r-m79c-wq3v","title":"Electron: HTTP Response Header Injection in custom protocol handlers and webRequest","description":"### Impact\nApps 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.\n\nAn 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.\n\nApps that do not reflect external input into response headers are not affected.\n\n### Workarounds\nValidate or sanitize any untrusted input before including it in a response header name or value.\n\n### Fixed Versions\n* `41.0.3`\n* `40.8.3`\n* `39.8.3`\n* `38.8.6`\n\n### For more information\nIf there are any questions or comments about this advisory, send an email to [security@electronjs.org](mailto:security@electronjs.org)","status":"published","published":"2026-04-03T02:37:24Z","modified":"2026-04-06T23:10:30Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N","level":"medium"}],"cwes":["CWE-74","CWE-113"],"updated_at":"2026-11-02T14:39:50.076383Z"}],"nvd":[{"id":"CVE-2026-34767","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.","status":"published","published":"2026-04-04T00:16:17.337Z","modified":"2026-07-24T22:10:00.14Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-74","CWE-113"],"updated_at":"2026-11-02T14:12:13.1424Z"}],"osv":[{"id":"CVE-2026-34767","title":"Electron: HTTP Response Header Injection in custom protocol handlers and webRequest","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.","status":"published","published":"2026-04-03T23:43:09.327Z","modified":"2026-10-28T10:49:34.358370661Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N","level":"medium"}],"cwes":["CWE-113","CWE-74"],"updated_at":"2026-11-02T15:45:02.247031Z"},{"id":"GHSA-4p4r-m79c-wq3v","title":"Electron: HTTP Response Header Injection in custom protocol handlers and webRequest","description":"### Impact\nApps 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.\n\nAn 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.\n\nApps that do not reflect external input into response headers are not affected.\n\n### Workarounds\nValidate or sanitize any untrusted input before including it in a response header name or value.\n\n### Fixed Versions\n* `41.0.3`\n* `40.8.3`\n* `39.8.3`\n* `38.8.6`\n\n### For more information\nIf there are any questions or comments about this advisory, send an email to [security@electronjs.org](mailto:security@electronjs.org)","status":"published","published":"2026-04-03T02:37:24Z","modified":"2026-04-06T23:21:01.480605Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N","level":"medium"}],"cwes":["CWE-113","CWE-74"],"updated_at":"2026-11-02T15:46:37.148947Z"}]}}