CVE-2026-41683

{
  "id": "CVE-2026-41683",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-08T16:16:11.320",
  "lastModified": "2026-10-26T18:10:00.173",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "i18next-http-middleware es un middleware para usar con frameworks web de Node.js como express o Fastify y también para Deno. Antes de la versión 3.9.3, i18next-http-middleware escribía valores de idioma controlados por el usuario en el encabezado de respuesta ’Content-Language’ después de pasarlos por utils.escape(), que es un codificador de entidades HTML que no elimina el retorno de carro, el salto de línea u otros caracteres de control. Cuando la aplicación usaba una versión anterior de i18next (menor que 19.5.0) que aún ejercía el fallback de compatibilidad con versiones anteriores en LanguageDetector.js:100 o de otro modo producía un valor detectado en bruto, las secuencias CRLF en el parámetro lng controlado por el atacante llegaban a res.setHeader(’Content-Language’, ...) literalmente. Este problema ha sido parcheado en la versión 3.9.3."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "i18next",
          "product": "i18next-http-middleware",
          "versions": [
            {
              "version": "< 3.9.3",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-08T23:28:40.338694Z",
          "id": "CVE-2026-41683",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-113"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-c3h8-g69v-pjrg",
      "source": "[email protected]"
    }
  ]
}