CVE-2026-105741
Published:October 05, 2026
Updated:October 11, 2026
Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.5.0 until 1.10.3, an IP spoofing vulnerability in the Model Context Protocol (MCP) configuration installation endpoint (POST /api/v1/mcp/project/{project_id}/install) allowed authenticated remote attackers to bypass the "local-only" access restriction. By sending a spoofed X-Forwarded-For: 127.0.0.1 header, an attacker could make the server treat the request as originating from localhost, letting them write/overwrite an MCP client configuration file on the server's filesystem. This vulnerability is fixed in 1.10.3.
Affected Packages
langflow-base (CONDA):
Affected version(s) >=1.10.1 <1.10.3Fix Suggestion:
Update to version 1.10.3langflow (CONDA):
Affected version(s) >=1.10.1 <1.10.3Fix Suggestion:
Update to version 1.10.3https://github.com/langflow-ai/langflow.git (GITHUB):
Affected version(s) >=v1.4.3.dev0 <v1.10.3Fix Suggestion:
Update to version v1.10.3langflow-base (PYTHON):
Affected version(s) >=0.5.0 <0.10.3Fix Suggestion:
Update to version 0.10.3langflow (PYTHON):
Affected version(s) >=1.5.0 <1.10.3Fix Suggestion:
Update to version 1.10.3Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
EPSS
Base Score:
0.21