{"id":"CVE-2026-41683","revision":"b96672d7d33e41dd8c64e50c02d58713","records":[{"revision":"b96672d7d33e41dd8c64e50c02d58713","observedAt":"2026-10-25T09:17:41.905+00:00","statement":{"source":"nvd","id":"CVE-2026-41683","aliases":[],"title":"i18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Prior to version 3.9.3, i18next-http-middleware wrote user-controlled language values into the Content-Language respon…","description":"i18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Prior to version 3.9.3, i18next-http-middleware wrote user-controlled language values into the Content-Language response header after passing them through utils.escape(), which is an HTML-entity encoder that does not strip carriage return, line feed, or other control characters. When the application used an older i18next (< 19.5.0) that still exercised the backward-compatibility fallback at LanguageDetector.js:100 or otherwise produced a raw detected value, CRLF sequences in the attacker-controlled lng parameter reached res.setHeader('Content-Language', ...) verbatim. This issue has been patched in version 3.9.3.","state":0,"publishedAt":"2026-05-08T16:16:11.32+00:00","modifiedAt":"2026-06-17T10:46:59.9+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","score":8.6,"severity":"HIGH"}],"references":["https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-c3h8-g69v-pjrg"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-41683","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-79","CWE-113"],"productCriteria":[],"sourceDates":{"published":"2026-05-08T16:16:11.320","lastModified":"2026-06-17T10:46:59.900"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-41683","identifiers":["CVE-2026-41683"]},"retained":false,"historicalAffected":[]}],"coverage":[]}