CVE-2026-118258
i18next-http-backend: Query-parameter injection through & and = in lng when loadPath/addPath puts {{lng}} in the query string
i18next-http-backend is a backend layer for i18next that loads translation resources in Node.js, browsers, and Deno. Prior to 4.0.4, interpolateUrl inserts unencoded language and namespace values into loadPath or addPath templates without rejecting ampersand (&), equals (=), or semicolon (;) query separators. When a template places lng or ns in the query string and an attacker controls that value, the attacker can add or override parameters on browser or server-side translation requests, potentially exposing other namespaces or tenants or changing backend behavior through the application's network position and credentials. This vulnerability is the result of an incomplete fix for CVE-2026-41691. This issue is fixed in version 4.0.4.
Fixes and workarounds
Fix
i18next-http-backend (npm): OSV reports a fixed version 4.0.4. Check the advisory for supported release branches.
Source: OSV GHSA-3cmx-xjww-583xAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| i18next-http-backend i18next |
< 4.0.4 (affected) | CNA: GitHub_M |
i18next-http-backendi18next-http-backend
npm |
≥ 0; < 4.0.4 (affected, semver); OSV events: introduced 0; fixed 4.0.4Source events (semver)Other versions: unaffected |
OSV GHSA-3cmx-xjww-583x |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 3.7 low |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N | CNA: GitHub_M |
Exploit evidence
- https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-3cmx-xjww-583x
exploit · ADP: CISA-ADP
References
- https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-3cmx-xjww-583xCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/i18next/i18next-http-backend/commit/b0eef9efd425055c554787cef7f878de33bbf510CNA: GitHub_M · x_refsource_MISC
- https://github.com/i18next/i18next-http-backend/releases/tag/v4.0.4CNA: GitHub_M · x_refsource_MISC
- https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-3cmx-xjww-583xADP: CISA-ADP · exploit
- https://github.com/advisories/GHSA-3cmx-xjww-583xOSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-3cmx-xjww-583xOSV / GitHub Security Advisories · osv
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