{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BBEECE25-1AC0-4A93-8CA9-3C1AEBF85E86",
              "versionEndExcluding": "2.11.38",
              "versionStartIncluding": "2.11.9",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "07558342-0979-427E-A153-610F1B378CD6",
              "versionEndExcluding": "3.6.9",
              "versionStartIncluding": "3.1.3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Traefik is an HTTP reverse proxy and load balancer. From version 2.11.9 to 2.11.37 and from version 3.1.3 to 3.6.8, there is a potential vulnerability in Traefik managing the Connection header with X-Forwarded headers. When Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed X-Forwarded headers (such as X-Real-Ip, X-Forwarded-Host, X-Forwarded-Port, etc.) via the Connection header does not handle case sensitivity correctly. The Connection tokens are compared case-sensitively against the protected header names, but the actual header deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase Connection tokens (e.g. Connection: x-real-ip) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers. This issue has been patched in versions 2.11.38 and 3.6.9."
    },
    {
      "lang": "es",
      "value": "Traefik es un proxy inverso HTTP y un equilibrador de carga. Desde la versi\u00f3n 2.11.9 hasta la 2.11.37 y desde la versi\u00f3n 3.1.3 hasta la 3.6.8, existe una potencial vulnerabilidad en Traefik al gestionar el encabezado Connection con los encabezados X-Forwarded. Cuando Traefik procesa solicitudes HTTP/1.1, la protecci\u00f3n implementada para evitar la eliminaci\u00f3n de los encabezados X-Forwarded gestionados por Traefik (como X-Real-Ip, X-Forwarded-Host, X-Forwarded-Port, etc.) a trav\u00e9s del encabezado Connection no maneja correctamente la distinci\u00f3n entre may\u00fasculas y min\u00fasculas. Los tokens de Connection se comparan con distinci\u00f3n entre may\u00fasculas y min\u00fasculas con los nombres de los encabezados protegidos, pero la eliminaci\u00f3n real del encabezado opera sin distinci\u00f3n entre may\u00fasculas y min\u00fasculas. Como resultado, un cliente remoto no autenticado puede usar tokens de Connection en min\u00fasculas (p. ej., Connection: x-real-ip) para eludir la protecci\u00f3n y activar la eliminaci\u00f3n de los encabezados de identidad reenviados gestionados por Traefik. Este problema ha sido parcheado en las versiones 2.11.38 y 3.6.9."
    }
  ],
  "id": "CVE-2026-29054",
  "lastModified": "2026-03-06T15:26:20.060",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-05T19:16:15.277",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/traefik/traefik/releases/tag/v2.11.38"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/traefik/traefik/releases/tag/v3.6.9"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-92mv-8f8w-wq52"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-178"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}