CVE-2026-118258

Name	CVE-2026-118258
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
node-i18next-http-backend (PTS)	bookworm	2.1.1-1	fixed
	forky, sid, trixie	2.4.1+ds-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
node-i18next-http-backend	source	(unstable)	(not affected)

Notes

- node-i18next-http-backend <not-affected> (Incomplete fix for CVE-2026-41691 not applied)
https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-3cmx-xjww-583x
Fixed by: https://github.com/i18next/i18next-http-backend/commit/b0eef9efd425055c554787cef7f878de33bbf510 (v4.0.4)
CVE exists because of an incomplete fix for CVE-2026-41691 / GHSA-q89c-q3h5-w34g