Path Traversal and SSRF Vulnerability in i18next-http-middleware for Node.js
CVE-2026-42353

8.2HIGH

Key Information:

Vendor

I18next

Status
I18next-http-middleware
Vendor
CVE Published:
8 May 2026

What is CVE-2026-42353?

The i18next-http-middleware, utilized in Node.js frameworks like Express and Fastify, contains a vulnerability that allows user-supplied lng and ns parameters to be passed directly into the backend loading process without appropriate sanitization. This flaw can facilitate path traversal or Server-Side Request Forgery (SSRF) attacks, depending on the backend configuration. Users are advised to upgrade to version 3.9.3 where this issue has been resolved.

Affected Version(s)

i18next-http-middleware < 3.9.3

References

https://github.com/i18next/i18next-http-middleware/securi...
x_refsource_CONFIRM

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.