CVE-2026-42353CWE-22CWE-918

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

High · published May 8, 2026

CVSS v3.1
8.2
EPSS
0%
Percentile
37.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00437 · 37.0th percentile
Weaknesses
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'); CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-05-08T15:29Z
EPSS history
Timeline
  • 08 MAY 15:29Z
    Path traversal / SSRF in i18next-http-middleware via user-controlled language and namespace parameters
    cvelistv5