CVE-2026-105741
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.
- CVSS 3.1
- 7.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L - EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 15% of CVEs (scores of 2026-10-25)
- CWEs
- CWE-290, CWE-345
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-4f6c-2vvp-gw82 | PyPI | langflow | >=1.5.0 <1.10.3 | 1.10.3 |
| PYSEC-2026-4229 | PyPI | langflow | >=1.5.0 <1.10.3 | 1.10.3 |
References
- https://github.com/langflow-ai/langflow/commit/1f39a4b9d62c9dfa1b21fa7f85e23a180c351b72
- https://github.com/langflow-ai/langflow/commit/94859df33acd70b2a1f816e26d68f5e89a7e5639
- https://github.com/langflow-ai/langflow/pull/13915
- https://github.com/langflow-ai/langflow/releases/tag/v1.10.3
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-4f6c-2vvp-gw82