AI agent vulnerability · Langflow

CVE-2026-6596: Langflow: DoS Through Lack of File Size Restriction via Deprecated Unauthenticated File Upload API

mediumCVSS 4.0 5.5 · 3.1 7.3GHSA-vvfc-fp59-m92g

A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function createuploadfile of the file src/backend/base/Langflow/api/v1/endpoints.py of the component API Endpoint. The manipulation results in unrestricted upload. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.

Published Apr 20, 2026 · Updated Jun 18, 2026

Affected packages

langflow-base

Ecosystem: PyPI
Affected: < 0.9.1
Fixed in: 0.9.1
Check: pip show langflow-base

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_file of the file src/backend/base/Langflow/api/v1/endpoints.py of the component API Endpoint. The manipulation results in unrestricted upload. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Credited to ventusfortis.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

More Langflow vulnerabilities

All Langflow entries