| Component | Langflow |
| Severity | medium (CVSS 6.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| Published (NVD) | 2026-04-20 |
| Last modified | 2026-06-17 |
| Affected versions | <= 1.8.3 read from the advisory text: NVD has not published CPE data yet |
| Fixed in | see the vendor advisory |
| Weakness | CWE-74CWE-707 |
| CISA KEV | not listed |
NVD description
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.
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep Langflow off the public internet until a fix ships.
- Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-6599
- https://gist.github.com/chenhouser2025/a909c47316b7a0948ee68c109ab747a3
- https://vuldb.com/submit/791922
- https://vuldb.com/vuln/358234
- https://vuldb.com/vuln/358234/cti
Read more
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