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{"schema_version":"1.9.0","id":"GHSA-vrch-868g-9jx5","published":"2025-05-28T14:25:09Z","modified":"2025-11-27T08:59:46.377512Z","aliases":["CVE-2025-47952","GO-2025-3719"],"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>","affected":[{"package":{"name":"github.com/traefik/traefik/v3","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik/v3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.4.1"}]}],"database_specific":{"last_known_affected_version_range":"<= 3.4.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/05/GHSA-vrch-868g-9jx5/GHSA-vrch-868g-9jx5.json"}},{"package":{"name":"github.com/traefik/traefik/v2","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.25"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/05/GHSA-vrch-868g-9jx5/GHSA-vrch-868g-9jx5.json"}},{"package":{"name":"github.com/traefik/traefik","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.7.34"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/05/GHSA-vrch-868g-9jx5/GHSA-vrch-868g-9jx5.json"}}],"references":[{"type":"WEB","url":"https://github.com/traefik/traefik/security/advisories/GHSA-vrch-868g-9jx5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-47952"},{"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"],"github_reviewed":true,"github_reviewed_at":"2025-05-28T14:25:09Z","nvd_published_at":"2025-05-30T04:15:46Z","severity":"LOW"},"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"}]} |