{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.11.57"
              },
              {
                "introduced": "3.0.0"
              },
              {
                "fixed": "3.7.13"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "839eb7f48a16849f22762b7e3bdfc58253146cd7"
            },
            {
              "introduced": "d99d2f95e66a28ee8180634dc80fdf13ba68c62a"
            },
            {
              "fixed": "fc92cc118a0557a029c7019d5ee06665127b0f13"
            },
            {
              "fixed": "58d1e9ca204526823211e30fd4634101c59d58e9"
            }
          ],
          "repo": "https://github.com/traefik/traefik",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-f52w-8j3h-j724"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1286",
      "CWE-444"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88009.json"
  },
  "details": "Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.",
  "id": "CVE-2026-88009",
  "modified": "2026-09-16T03:30:14.962885114Z",
  "published": "2026-09-10T15:01:56.971Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v2.11.57"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.7.13"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88009.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88009"
    },
    {
      "type": "FIX",
      "url": "https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9"
    },
    {
      "type": "FIX",
      "url": "https://github.com/traefik/traefik/pull/13796"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Traefik: Rootless HTTP/1 request-target routes as \"/\" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging"
}