---
id: CVE-2026-6596
aliases:
  - GHSA-vvfc-fp59-m92g
  - PYSEC-2026-2572
title: >-
  Langflow: DoS Through Lack of File Size Restriction via Deprecated
  Unauthenticated File Upload API
summary: >-
  Langflow: DoS Through Lack of File Size Restriction via Deprecated
  Unauthenticated File Upload API
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'
vendor: langflow-base
product: langflow-base
ecosystem: pip
affected:
  - langflow-base < 0.9.1
patched:
  - langflow-base 0.9.1
published: '2026-04-20'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-vvfc-fp59-m92g'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-6596'
  - url: >-
      https://github.com/langflow-ai/langflow/commit/b5662446bc8c54d928e278d3d26ad95b62425815
  - url: 'https://gist.github.com/chenhouser2025/c2aabfdee41009cfe45d28a9924742a0'
  - url: 'https://github.com/langflow-ai/langflow'
  - url: 'https://github.com/langflow-ai/langflow/commits/v1.9.1'
  - url: 'https://vuldb.com/submit/791919'
  - url: 'https://vuldb.com/vuln/358231'
  - url: 'https://vuldb.com/vuln/358231/cti'
tags:
  - osv
  - pip
epss: 0.00284
epssPercentile: 0.21206
ingestedAt: '2026-07-13T18:58:03.839Z'
---

## Overview

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.

## Affected packages

- `langflow-base < 0.9.1`

## Remediation

Upgrade to a patched release:

- `langflow-base 0.9.1`