CVE-2026-55450
Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
CVSS Score
9.3
EPSS Score
0.0%
EPSS Percentile
0th
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, 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. This vulnerability is fixed in 1.9.1.
| CWE | CWE-200 CWE-306 CWE-400 |
| Vendor | langflow-ai |
| Product | langflow |
| Published | Jun 23, 2026 |
| Last Updated | Jun 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
High
Affected Versions
langflow-ai / langflow
< 1.9.1