CVE-2026-55450

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

Published Jun 23, 2026 CVSS 3.1 · 9.3 Critical EPSS 1.2% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-x223-p2gf-v735 Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
History
Type Values Removed Values Added
First Time appeared Langflow
Langflow langflow
Vendors & Products Langflow
Langflow langflow
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
Weaknesses CWE-200
CWE-306
CWE-400
References
Metrics cvssV3_1

{'score': 9.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 23, 2026, 5:02 PM
Reserved
Jun 16, 2026, 9:59 PM
Status
Analyzed
Published
Jun 23, 2026, 5:17 PM
Modified
Oct 25, 2026, 11:10 PM