{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "2.11.9"
              },
              {
                "fixed": "2.11.38"
              }
            ]
          },
          "events": [
            {
              "introduced": "06d7fab820dc1e486fe59371aeb359c965767ded"
            },
            {
              "fixed": "7c55452b21e7465d95bd731725c7222f7626265b"
            }
          ],
          "repo": "https://github.com/traefik/traefik",
          "type": "GIT"
        },
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "3.1.3"
              },
              {
                "fixed": "3.6.9"
              }
            ]
          },
          "events": [
            {
              "introduced": "89f3b272c3d4ed3f075f92f8acca494cdba4f708"
            },
            {
              "fixed": "65f9d0663202b0ebf7941da0c4af0f1953525ce6"
            }
          ],
          "repo": "https://github.com/traefik/traefik",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-92mv-8f8w-wq52"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-178"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29054.json"
  },
  "details": "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.",
  "id": "CVE-2026-29054",
  "modified": "2026-04-01T23:10:20.920794959Z",
  "published": "2026-03-05T16:18:49.230Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v2.11.38"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.6.9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29054.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-92mv-8f8w-wq52"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29054"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Traefik: lowercase `Connection` tokens can delete traefik-managed forwarded identity headers (for example, `X-Real-Ip`)"
}