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.
History

Sun, 10 May 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared I18next
I18next i18next-http-middleware
Vendors & Products I18next
I18next i18next-http-middleware

Sat, 09 May 2026 00:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 08 May 2026 16:00:00 +0000

Type Values Removed Values Added
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.
Title Path traversal / SSRF in i18next-http-middleware via user-controlled language and namespace parameters
Weaknesses CWE-22
CWE-918
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-08T23:30:15.045Z

Reserved: 2026-04-26T13:26:14.515Z

Link: CVE-2026-42353

cve-icon Vulnrichment

Updated: 2026-05-08T23:30:06.475Z

cve-icon NVD

Status : Received

Published: 2026-05-08T16:16:12.197

Modified: 2026-05-08T16:16:12.197

Link: CVE-2026-42353

cve-icon Redhat

No data.