CVE-2026-42353

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

State: Published
Severity: 8.2 High
Published: May 8, 2026
Updated: May 8, 2026
Reserved: Apr 26, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.2 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
i18next-http-middlewarei18next	< 3.9.3Affected

References

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

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