CVE-2026-42353 — Path traversal / SSRF in i18next-http-middleware via user-controlled language and namespace parameters

CVE-2026-42353

Path traversal / SSRF in i18next-http-middleware via user-controlled language and namespace parameters PUBLISHED

Description (CNA)

i18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Prior to version 3.9.3, i18next-http-middleware passes the user-controlled lng and ns values from getResourcesHandler directly into i18next.services.backendConnector.load(languages, namespaces, …) without any sanitization. Depending on which backend is configured, the unvalidated path segments enable either path traversal or SSRF. This issue has been patched in version 3.9.3.

Affected (CNA)

Vendor / product	Versions
i18next / i18next-http-middleware	affected < 3.9.3

CWE

CWE-22, CWE-918

References

https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-jfgf-83c5-2c4m

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.