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CVE-2026-41693— i18next-fs-backend: Path traversal via unsanitised lng/ns allows arbitrary file read/overwrite

Quick assessment

Affected
i18next i18next-fs-backend
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

i18next-fs-backend是i18next开源的一款用于 Node.js 和 Deno 环境的后端层，用于从文件系统中加载翻译资源。 i18next-fs-backend 2.6.4之前版本存在路径遍历漏洞，该漏洞源于将lng和ns选项直接替换到loadPath/addPath模板中且未编码和验证，可能导致路径遍历攻击。

CVSS 8.2 · High EPSS 0.43% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
i18next i18next-fs-backend < 2.6.4 affected
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I. Basic Information for CVE-2026-41693

Vulnerability Information
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Vulnerability Title
i18next-fs-backend: Path traversal via unsanitised lng/ns allows arbitrary file read/overwrite
Source: CVE Program / CVE List V5
Vulnerability Description
i18next-fs-backend is a backend layer for i18next using in Node.js and for Deno to load translations from the filesystem. Prior to version 2.6.4, i18next-fs-backend substitutes the lng and ns options directly into the configured loadPath / addPath templates and then read / write the resulting file from disk. The interpolation is unencoded and unvalidated, so a crafted lng or ns value — containing .., a path separator, a control character, a prototype key, or simply an unexpectedly long string — allows an attacker who can influence either value to read or overwrite files outside the intended locale directory. When lng / ns are derived from untrusted input (request-scoped i18next instances behind an HTTP layer such as i18next-http-middleware, or any framework that lets the end user pick the language via query string, cookie, or header), a single request such as ?lng=../../../../etc/passwd causes the backend to attempt to read that path. This issue has been patched in version 2.6.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
i18next-fs-backend 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
i18next-fs-backend是i18next开源的一款用于 Node.js 和 Deno 环境的后端层，用于从文件系统中加载翻译资源。 i18next-fs-backend 2.6.4之前版本存在路径遍历漏洞，该漏洞源于将lng和ns选项直接替换到loadPath/addPath模板中且未编码和验证，可能导致路径遍历攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
i18next i18next-fs-backend < 2.6.4 -

II. Public POCs for CVE-2026-41693

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III. Intelligence Information for CVE-2026-41693

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Vendor Advisories for CVE-2026-41693 (1)

Same Patch Batch · i18next · 2026-05-08 · 4 CVEs total

CVE-2026-41683 8.6 HIGH HTTP response splitting and DoS in i18next-http-middleware via unsanitised Content-Languag
CVE-2026-41690 8.6 HIGH Prototype pollution and path traversal in i18next-http-middleware via user-controlled lang
CVE-2026-42353 8.2 HIGH Path traversal / SSRF in i18next-http-middleware via user-controlled language and namespac

IV. Related Vulnerabilities

Same product: i18next-fs-backend
Same vendor: i18next
Same weakness: CWE-73

V. Comments for CVE-2026-41693

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