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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-vrch-868g-9jx5",
+  "modified": "2025-05-28T14:25:10Z",
+  "published": "2025-05-28T14:25:09Z",
+  "aliases": [
+    "CVE-2025-47952"
+  ],
+  "summary": "Traefik allows path traversal using url encoding",
+  "details": "## Impact\n\nThere is a potential vulnerability in Traefik managing the requests using a `PathPrefix`, `Path` or `PathRegex` matcher.\n\nWhen Traefik is configured to route the requests to a backend using a matcher based on the path, if the URL contains a URL encoded string in its path, it’s possible to target a backend, exposed using another router, by-passing the middlewares chain.\n\n## Example\n\n```yaml\napiVersion: traefik.io/v1alpha1\nkind: IngressRoute\nmetadata:\n  name: my-service\nspec:\n  routes:\n    - match: PathPrefix(‘/service’)\n      kind: Rule\n      services:\n        - name: service-a\n          port: 8080\n      middlewares:\n        - name: my-middleware-a\n    - match: PathPrefix(‘/service/sub-path’)\n      kind: Rule\n      services:\n        - name: service-a\n          port: 8080\n```\n\nIn such a case, the request `http://mydomain.example.com/service/sub-path/%2e%2e/other-path` will reach the backend `my-service-a` without operating the middleware `my-middleware-a` unless the computed path is `http://mydomain.example.com/service/other-path` and should be computes by the first router (operating `my-middleware-a`).\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.25\n- https://github.com/traefik/traefik/releases/tag/v3.4.1\n\n## For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n<details>\n<summary>Original Description</summary>\n### Summary\n\nPath traversal with \"/../\" using URL encodings (\"/%2e%2e\") allows for circumventing routing rules. \n\n### Details\n\nWhen having defined a route, you can path traverse using the URL encoded variant of /../ and reach endpoints that are not made publicly available. This issue has been found and fixed earlier with regular /../ and has been fixed in this CVE. This URL encoding trick works around that\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-32431\n\nSimply implementing a check on the URL encoding won't be sufficient as path traversal can take numerous formats. See examples here:\nhttps://book.hacktricks.wiki/en/pentesting-web/file-inclusion/index.html\n\n### PoC\n\nSetup a service with two endpoints: \"/public\" and \"/private\", which returns a 200 OK for both\nSetup a Traefik proxy with a single route which points to the service using path /public\n\nRegular requests to traefik /public will return 200 OK and to /private should return 404 (response by Traefik)\nWhen making a request to /public/%2e%2e/private you should receive a 200 OK.\n\n### Impact\nImpacts all traefik implementations with path prefix routes that expose only part of the downstream api\n\n### Suggestion\nProvide configuration property which disables all path traversals. Steps:\n1. Decode URL\n2. Evaluate and construct relative path (do traversal before route evaluation)\n3. Compare relative/evaluated path to configured routes (PathPrefix/pathRegexp)\n</details>",
+  "severity": [
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/traefik/traefik/v3"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "3.4.1"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 3.4.0"
+      }
+    },
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/traefik/traefik/v2"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "2.11.25"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 2.11.24"
+      }
+    },
+    {
+      "package": {
+        "ecosystem": "Go",
+        "name": "github.com/traefik/traefik"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "last_affected": "1.7.34"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-vrch-868g-9jx5"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/traefik/traefik/commit/08d5dfee0164aa54dd44a467870042e18e8d3f00"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/traefik/traefik"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/traefik/traefik/releases/tag/v2.11.25"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/traefik/traefik/releases/tag/v3.4.1"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-22"
+    ],
+    "severity": "LOW",
+    "github_reviewed": true,
+    "github_reviewed_at": "2025-05-28T14:25:09Z",
+    "nvd_published_at": null
+  }
+}
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