{"id":"CVE-2026-41885","aliases":["GHSA-mgcp-mfp8-3q45"],"url":"https://o3.security/vulnerability/CVE-2026-41885","summary":"Path traversal / URL injection via unsanitised lng/ns/projectId/version in i18next-locize-backend","details":"i18next-locize-backend is a simple i18next backend for locize.com which can be used in Node.js, in the browser and for Deno. Prior to version 9.0.2, i18next-locize-backend interpolates lng, ns, projectId, and version directly into the configured loadPath / privatePath / addPath / updatePath / getLanguagesPath URL templates with no path-component validation and no encoding. When an application exposes any of these values to user-controlled input (?lng= / ?ns= query parameters via i18next-browser-languagedetector, cookies, request headers, or a URL-derived projectId), a crafted value can change the structure of the outgoing request URL. Affected call sites in lib/index.js (pre-patch): the interpolate() helper is used at the five URL-build sites — _readAny/read (line 415 for private, 426 for public), getLanguages (lines 271 and 296), and writePage (lines 616 and 622) for the missing-key and update POST paths. The helper interpolate in lib/utils.js substitutes raw values with no encoding. This issue has been patched in version 9.0.2.","published":"2026-05-08T15:41:14.065Z","modified":"2026-08-07T11:31:35.054185536Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"i18next-locize-backend","fixedVersion":"9.0.2"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41885.json"},{"type":"ADVISORY","url":"https://github.com/locize/i18next-locize-backend/security/advisories/GHSA-mgcp-mfp8-3q45"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41885"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:35.054185536Z"}}