CVE-2026-118258 i18next-http-backend: Query-parameter injection through & and = in lng when loadPath/addPath puts {{lng}} in the query string
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-118258?
CVE-2026-118258 is a low-severity vulnerability in i18next-http-backend, published on 28 Oct 2026.
Official 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.
Weakness: CWE-74
Which versions are affected by CVE-2026-118258?
2 open source packages ship an affected version, including i18next-http-backend.
| Package | Affected | Fixed in |
|---|---|---|
i18next-http-backend npm | All versions | 4.0.4 |
i18next-http-backend npm | All versions | 4.0.4 |
How do I fix CVE-2026-118258?
Upgrade i18next-http-backend to 4.0.4 or later.
Is CVE-2026-118258 being exploited?
There is no known exploitation of CVE-2026-118258 in the wild and no public exploit code.
Sources
Also known as GHSA-3cmx-xjww-583x, UBUNTU-CVE-2026-118258.