i18next-http-backend is a backend layer for i18next that loads translation resources in Node.js, browsers, and Deno. Prior to 4.0.2, attacker-controlled language or namespace values interpolated into a custom loadPath or addPath that begins directly with {{lng}} or {{ns}} can make colon-based input become an absolute URL or, in browsers, make a double-slash namespace become a protocol-relative URL. The resulting request can leave the intended origin and cause URL injection or server-side request forgery. The default /locales/{{lng}}/{{ns}}.json template and templates with a leading path or origin are not affected because the placeholder does not occupy the URL's structural beginning. This issue is fixed in version 4.0.2.
History

Fri, 09 Oct 2026 08:15:00 +0000

Type Values Removed Values Added
First Time appeared I18next
I18next i18next-http-backend
Vendors & Products I18next
I18next i18next-http-backend

Wed, 07 Oct 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Tue, 06 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 06 Oct 2026 15:00:00 +0000

Type Values Removed Values Added
Description i18next-http-backend is a backend layer for i18next that loads translation resources in Node.js, browsers, and Deno. Prior to 4.0.2, attacker-controlled language or namespace values interpolated into a custom loadPath or addPath that begins directly with {{lng}} or {{ns}} can make colon-based input become an absolute URL or, in browsers, make a double-slash namespace become a protocol-relative URL. The resulting request can leave the intended origin and cause URL injection or server-side request forgery. The default /locales/{{lng}}/{{ns}}.json template and templates with a leading path or origin are not affected because the placeholder does not occupy the URL's structural beginning. This issue is fixed in version 4.0.2.
Title i18next-http-backend incomplete URL validation permits SSRF
Weaknesses CWE-74
CWE-918
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-06T14:48:05.267Z

Updated: 2026-10-06T17:19:14.493Z

Reserved: 2026-10-05T20:37:19.364Z

Link: CVE-2026-105800

cve-icon Vulnrichment

Updated: 2026-10-06T17:19:11.162Z

cve-icon NVD

Status : Deferred

Published: 2026-10-06T15:17:17.173

Modified: 2026-10-06T18:16:47.547

Link: CVE-2026-105800

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-06T14:48:05Z

Links: CVE-2026-105800 - Bugzilla