---
id: CVE-2026-6599
aliases:
  - GHSA-v66p-f7x3-4794
  - PYSEC-2026-2569
title: Langflow vulnerable to injection
summary: Langflow vulnerable to injection
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
vendor: langflow
product: langflow
ecosystem: pip
affected:
  - langflow <= 1.8.3
published: '2026-04-20'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-v66p-f7x3-4794'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-6599'
  - url: 'https://gist.github.com/chenhouser2025/a909c47316b7a0948ee68c109ab747a3'
  - url: 'https://github.com/langflow-ai/langflow'
  - url: 'https://vuldb.com/submit/791922'
  - url: 'https://vuldb.com/vuln/358234'
  - url: 'https://vuldb.com/vuln/358234/cti'
tags:
  - osv
  - pip
epss: 0.00232
epssPercentile: 0.14392
ingestedAt: '2026-07-13T18:58:03.297Z'
---

## Overview

A vulnerability was detected in langflow-ai langflow up to 1.8.3. The impacted element is the function get_client_ip/install_mcp_config of the file src/backend/base/langflow/api/v1/mcp_projects.py of the component Model Context Protocol Configuration API. Performing a manipulation of the argument X-Forwarded-For results in injection. The attack may be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

## Affected packages

- `langflow <= 1.8.3`

## Remediation

Refer to the advisory for the patched release.