Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak

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Summary

CVECVE-2026-55450
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-23 17:17:08 UTC
Updated2026-06-23 18:18:09 UTC
DescriptionLangflow 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.

Risk And Classification

Primary CVSS: v3.1 9.3 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H

Problem Types: CWE-200 | CWE-306 | CWE-400 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-306 CWE-306: Missing Authentication for Critical Function | CWE-400 CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H
3.1CNADECLARED9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Langflow-ai Langflow affected < 1.9.1 Not specified

References

ReferenceSourceLinkTags
github.com/langflow-ai/langflow/pull/12831 [email protected] github.com
github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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