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

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

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

文件名或路径的外部可控制

i18next-fs-backend 路径遍历漏洞

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。

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