CVE-2026-41693: i18next-fs-backend Path Traversal Exposes Servers
The National Vulnerability Database has disclosed CVE-2026-41693, a high-severity path traversal vulnerability (CVSS 8.2) impacting i18next-fs-backend versions prior to 2.6.4. This Node.js and Deno library, used for loading translations from the filesystem, directly substitutes lng (language) and ns (namespace) options into file paths without proper encoding or validation. Attackers can exploit this by crafting malicious lng or ns values, such as ../../../../etc/passwd, to read or overwrite arbitrary files outside the intended locale directory.
This vulnerability is particularly dangerous when lng or ns values are derived from untrusted user input, a common scenario in web applications. Frameworks utilizing i18next-http-middleware, or any system allowing end-users to specify language via query strings, cookies, or headers, are at significant risk. A single crafted HTTP request can expose sensitive system files, leading to information disclosure or potential remote code execution if file overwrites are leveraged strategically.
Defenders must prioritize patching i18next-fs-backend to version 2.6.4 immediately. Beyond patching, review application architecture to ensure all user-supplied input used in file path construction is rigorously validated and sanitized. This isn’t just about i18next; it’s a stark reminder that trusting user input in filesystem operations is a critical security flaw.
What This Means For You
- If your Node.js or Deno applications use `i18next-fs-backend`, check your version immediately. Patch to 2.6.4 or later. This is a critical path traversal that allows attackers to read or overwrite arbitrary files, potentially leading to full system compromise. Don't assume your framework handles input validation for you; verify it.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-41693: i18next-fs-backend Path Traversal Attempt
title: CVE-2026-41693: i18next-fs-backend Path Traversal Attempt
id: scw-2026-05-08-ai-1
status: experimental
level: high
description: |
Detects attempts to exploit CVE-2026-41693 by looking for path traversal sequences within the query string of web requests. This indicates an attacker is trying to manipulate the 'lng' or 'ns' parameters of i18next-fs-backend to read or write files outside the intended directory.
author: SCW Feed Engine (AI-generated)
date: 2026-05-08
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-41693/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- '..%2f'
- '%2e%2e%2f'
- '../'
- '%2e%2e/'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-41693 | Path Traversal | i18next-fs-backend versions prior to 2.6.4 |
| CVE-2026-41693 | Path Traversal | Vulnerable component: i18next-fs-backend, due to unencoded and unvalidated interpolation of 'lng' and 'ns' options into loadPath/addPath templates. |
| CVE-2026-41693 | Information Disclosure | Attack vector: Crafted 'lng' or 'ns' value (e.g., ?lng=../../../../etc/passwd) to read files outside intended directory. |
| CVE-2026-41693 | Code Injection | Attack vector: Crafted 'lng' or 'ns' value to overwrite files outside intended directory. |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 08, 2026 at 19:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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