{"items":[{"id":"NVI-00018322","kind":"vulnerability","title":"Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-x223-p2gf-v735","CVE-2026-55450"],"plain_summary":"GitHub lists this reviewed advisory for langflow. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-109156ee36c82c40752972a98e84f0d5"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-06-17T18:43:13.000Z","value":"9.3 critical","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-109156ee36c82c40752972a98e84f0d5"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-109156ee36c82c40752972a98e84f0d5","url":"https://github.com/advisories/GHSA-x223-p2gf-v735","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-x223-p2gf-v735","publisher":"GitHub Advisory Database","observed_at":"2026-11-06T07:20:20.042Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-109156ee36c82c40752972a98e84f0d5"],"technology":"langflow","known_exclusions":[],"conditions_summary":"### Summary\nUnauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow.\n\nThis can lead to space exhaustion on the server.\n\nIn adition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives.\n\nTested on commit 2d67402b1dbaefcbce85a244d4a6cd5e4bda1cfe\n\n### Details\nCode is in `langflow/api/v1/endpoints.py`:\n```python\n@router.post(\n    \"/upload/{flow_id}\",\n    status_code=HTTPStatus.CREATED,\n    deprecated=True,\n)\nasync def create_upload_file(\n    file: UploadFile,\n    flow_id: UUID,\n) -> UploadFileResponse:\n...\n```\nAs can be seen above, there is no authentication. There is not validation over `flow_id` as well, unlike other endpoints:\n```\n        flow_id_str = str(flow_id)\n        file_path = await asyncio.to_thread(save_uploaded_file, file, folder_name=flow_id_str)\n```\nFunction `save_uploaded_file` saves the file to local file-system.\nSuggested fix:\n1. Add authentication to route.\n2. Only return relative path or filename.\n\n### PoC\nPoC:\n```bash\ncurl 'http://localh","public_affected_ranges":["< 1.9.1"]}],"null_published_at":"2026-11-07T07:07:39.812Z","source_updated_at":"2026-06-17T18:43:13.000Z","source_disclosed_at":"2026-06-17T18:43:12.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-06T07:20:20.042Z"}],"next_cursor":null,"snapshot_revision":"42594"}