{"id":"GHSA-ph9w-r52h-28p7","summary":"langflow: /profile_pictures/{folder_name}/{file_name} endpoint file reading","details":"## Vulnerability\n\n### Path Traversal in `GET /api/v1/files/profile_pictures/{folder_name}/{file_name}`\n\nThe `download_profile_picture` function in `src/backend/base/langflow/api/v1/files.py` constructed file paths by directly concatenating the user-supplied `folder_name` and `file_name` path parameters without sanitization or boundary validation. The resulting path was passed to the filesystem without verifying it remained within the intended directory.\n\nAn unauthenticated attacker could supply traversal sequences (e.g. `../secret_key`) to navigate outside the profile pictures directory and read arbitrary files on the server filesystem.\n\nThis exposed the server to:\n\n- **Sensitive file disclosure** — any file readable by the application process could be retrieved\n- **Secret key exfiltration** — the application's `secret_key` file, used as JWT signing material, could be read directly via `../secret_key`\n- **Authentication bypass** — with the `secret_key` in hand, an attacker can forge valid JWT tokens and authenticate as any user, including administrators\n\n---\n\n## Proof of Concept\n\n```bash\ncurl --path-as-is 'http://\u003chost\u003e:7860/api/v1/files/profile_pictures/../secret_key'\n```\n\nA successful response returns the raw secret key value used to sign all JWT authentication tokens in the instance.\n\n---\n\n## Fix\n\nThe fix was applied in `src/backend/base/langflow/api/v1/files.py` (PR #12263).\n\nTwo layers of defense were introduced:\n\n**1. Typed path validation** — the `folder_name` and `file_name` parameters were changed from plain `str` to `ValidatedFolderName` and `ValidatedFileName` annotated types that reject traversal characters at the FastAPI input layer.\n\n**2. Path containment check** — `Path.name` is used to strip any directory component from the inputs before path construction, and `Path.is_relative_to()` verifies the resolved path remains within the allowed base directory. This replaces the previous `startswith()` check, which was susceptible to prefix-ambiguity bugs.\n\n```diff\n @router.get(\"/profile_pictures/{folder_name}/{file_name}\")\n async def download_profile_picture(\n-    folder_name: str,\n-    file_name: str,\n+    folder_name: ValidatedFolderName,\n+    file_name: ValidatedFileName,\n     settings_service: Annotated[SettingsService, Depends(get_settings_service)],\n ):\n```\n\n```diff\n-        file_path = (config_path / \"profile_pictures\" / folder_name / file_name).resolve()\n+        safe_folder = Path(folder_name).name\n+        safe_file = Path(file_name).name\n+        file_path = (config_path / \"profile_pictures\" / safe_folder / safe_file).resolve()\n\n         allowed_base = (config_path / \"profile_pictures\").resolve()\n-        if not str(file_path).startswith(str(allowed_base)):\n-            raise HTTPException(status_code=404, detail=\"Profile picture not found\")\n+        if not file_path.is_relative_to(allowed_base):\n+            raise HTTPException(status_code=404, detail=\"Profile picture not found\")\n```\n\n---\n\n## Workarounds\n\nIf you cannot upgrade immediately, restrict network access to the `/api/v1/files/profile_pictures/` endpoint at the reverse-proxy or firewall level. Rotating the `secret_key` is strongly recommended if exposure cannot be ruled out.\n\n---\n\n## Acknowledgements\n\nWe thank the security researcher who responsibly disclosed this vulnerability.\n\n- [r00tuser111](https://github.com/r00tuser111)","aliases":["CVE-2026-33497","PYSEC-2026-81"],"modified":"2026-06-06T01:00:08.133229562Z","published":"2026-03-20T20:56:14Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-03-20T20:56:14Z","nvd_published_at":"2026-03-24T14:16:30Z","cwe_ids":["CWE-22"]},"references":[{"type":"WEB","url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-ph9w-r52h-28p7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33497"},{"type":"PACKAGE","url":"https://github.com/langflow-ai/langflow"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/langflow/PYSEC-2026-81.yaml"}],"affected":[{"package":{"name":"langflow","ecosystem":"PyPI","purl":"pkg:pypi/langflow"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.1"}]}],"versions":["0.0.31","0.0.32","0.0.33","0.0.40","0.0.44","0.0.45","0.0.46","0.0.52","0.0.53","0.0.54","0.0.55","0.0.56","0.0.57","0.0.58","0.0.61","0.0.62","0.0.63","0.0.64","0.0.65","0.0.66","0.0.67","0.0.68","0.0.69","0.0.70","0.0.71","0.0.72","0.0.73","0.0.74","0.0.75","0.0.76","0.0.78","0.0.79","0.0.80","0.0.81","0.0.83","0.0.84","0.0.85","0.0.86","0.0.87","0.0.88","0.0.89","0.1.0","0.1.2","0.1.3","0.1.4","0.1.5","0.1.6","0.1.7","0.2.0","0.2.1","0.2.10","0.2.11","0.2.12","0.2.13","0.2.2","0.2.3","0.2.4","0.2.5","0.2.6","0.2.7","0.2.8","0.2.9","0.3.0","0.3.1","0.3.2","0.3.3","0.3.4","0.4.0","0.4.1","0.4.10","0.4.11","0.4.12","0.4.14","0.4.15","0.4.16","0.4.17","0.4.18","0.4.19","0.4.2","0.4.20","0.4.21","0.4.3","0.4.4","0.4.5","0.4.6","0.4.7","0.4.8","0.4.9","0.5.0","0.5.0a0","0.5.0a1","0.5.0a2","0.5.0a3","0.5.0a4","0.5.0a5","0.5.0a6","0.5.0b0","0.5.0b2","0.5.0b3","0.5.0b4","0.5.0b5","0.5.0b6","0.5.1","0.5.10","0.5.11","0.5.12","0.5.2","0.5.3","0.5.4","0.5.5","0.5.6","0.5.7","0.5.8","0.5.9","0.6.0","0.6.0rc1","0.6.1","0.6.10","0.6.11","0.6.12","0.6.14","0.6.15","0.6.16","0.6.17","0.6.18","0.6.19","0.6.2","0.6.3","0.6.3a0","0.6.3a1","0.6.3a2","0.6.3a3","0.6.3a4","0.6.3a5","0.6.3a6","0.6.3a7","0.6.4","0.6.4a0","0.6.4a1","0.6.5","0.6.5a0","0.6.5a1","0.6.5a10","0.6.5a11","0.6.5a12","0.6.5a13","0.6.5a2","0.6.5a3","0.6.5a4","0.6.5a5","0.6.5a6","0.6.5a7","0.6.5a8","0.6.5a9","0.6.6","0.6.7","0.6.7a1","0.6.7a2","0.6.7a3","0.6.7a5","0.6.8","0.6.9","1.0.0","1.0.0a0","1.0.0a1","1.0.0a10","1.0.0a11","1.0.0a12","1.0.0a13","1.0.0a14","1.0.0a15","1.0.0a17","1.0.0a18","1.0.0a19","1.0.0a2","1.0.0a20","1.0.0a21","1.0.0a22","1.0.0a23","1.0.0a24","1.0.0a25","1.0.0a26","1.0.0a27","1.0.0a28","1.0.0a29","1.0.0a3","1.0.0a30","1.0.0a31","1.0.0a32","1.0.0a33","1.0.0a34","1.0.0a35","1.0.0a36","1.0.0a37","1.0.0a38","1.0.0a39","1.0.0a4","1.0.0a40","1.0.0a41","1.0.0a42","1.0.0a43","1.0.0a44","1.0.0a45","1.0.0a46","1.0.0a47","1.0.0a48","1.0.0a49","1.0.0a5","1.0.0a50","1.0.0a51","1.0.0a52","1.0.0a53","1.0.0a55","1.0.0a56","1.0.0a57","1.0.0a58","1.0.0a59","1.0.0a6","1.0.0a60","1.0.0a61","1.0.0a7","1.0.0a8","1.0.0a9","1.0.0rc0","1.0.0rc1","1.0.1","1.0.10","1.0.11","1.0.12","1.0.13","1.0.14","1.0.15","1.0.16","1.0.17","1.0.18","1.0.19","1.0.19.post1","1.0.19.post2","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.8","1.0.9","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.1.4.post1","1.2.0","1.3.0","1.3.1","1.3.2","1.3.3","1.3.4","1.4.0","1.4.1","1.4.2","1.4.3","1.5.0","1.5.0.post1","1.5.0.post2","1.5.1","1.6.0","1.6.1","1.6.2","1.6.3","1.6.4","1.6.5","1.6.6","1.6.7","1.6.8","1.6.9","1.7.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-ph9w-r52h-28p7/GHSA-ph9w-r52h-28p7.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}