CVE-2026-55450
Critical
Description
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.
SeverityCritical
CVSS9.3
Exploit probability—
Product
Langflow
PublishedJun 23, 2026
First seenJun 23, 2026
How to fix
Update
- langflow langflow1.9.1 or later
- langflow1.9.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| langflow langflow | v < 1.9.1 | 1.9.1 |
| langflowPyPI | v < 1.9.1 | 1.9.1 |
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