{"cve":"CVE-2026-41693","nvd":{"published":"2026-05-08T16:16:11.613","modified":"2026-06-17T10:47:00.940","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2},"cwes":["CWE-22","CWE-73"],"references":["https://github.com/i18next/i18next-fs-backend/security/advisories/GHSA-8847-338w-5hcj"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:33:55.586217763+00:00"},"epss":{"cve":"CVE-2026-41693","score":0.00292,"percentile":0.21767,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-8847-338w-5hcj","url":"https://osv.dev/vulnerability/GHSA-8847-338w-5hcj","summary":"i18next-fs-backend: Path traversal via unsanitised lng/ns allows arbitrary file read/overwrite","modified":"2026-05-13T13:50:03.856476Z","packages":[{"ecosystem":"npm","name":"i18next-fs-backend","purl":"pkg:npm/i18next-fs-backend","ranges":["<2.6.4"],"fixed":["2.6.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}