{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.11.52"
              },
              {
                "introduced": "3.6.0"
              },
              {
                "fixed": "3.6.23"
              },
              {
                "introduced": "3.7.0"
              },
              {
                "fixed": "3.7.7"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "00d92a043fdee9c562f4b1fda9c2d6f359a25eb2"
            },
            {
              "introduced": "06db5168c0d936a0716cbede56bc2cd332be0d4f"
            },
            {
              "fixed": "84d4e8b139d1ac5e5b2d250fff95baed5ba0584f"
            },
            {
              "introduced": "04aa6bb4f9776f2ba87e5cd181d250e3610e6419"
            },
            {
              "fixed": "b2c18b1e39fbe2099e4dce927e4e6e56674ede0f"
            }
          ],
          "repo": "https://github.com/traefik/traefik",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-cxjq-mrr5-89rv"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65600.json"
  },
  "details": "Traefik versions \u003c= v2.11.51, \u003e= v3.6.0 \u003c= v3.6.22, and \u003e= v3.7.0 \u003c= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex \"^/api(.*)\", replacement \"/$1\"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form. An unauthenticated remote attacker can send a crafted request (e.g. GET /api../admin) that produces an un-normalized path such as /../admin, which a backend that normalizes paths resolves to a protected route, bypassing authentication middleware. Fixed in v2.11.52, v3.6.23, and v3.7.7.",
  "id": "CVE-2026-65600",
  "modified": "2026-07-24T03:57:16.215520246Z",
  "published": "2026-07-22T11:21:46.783Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65600.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-cxjq-mrr5-89rv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-65600"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/traefik-before-authentication-bypass-via-replacepathregex"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex"
}