| Component | Langflow |
| Severity | medium (CVSS 6.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| Published (NVD) | 2026-09-04 |
| Last modified | 2026-09-10 |
| Affected versions | langflow >= 1.0.0, < 1.11.3 |
| Fixed in | 1.11.3 |
| Weakness | CWE-22 |
| CISA KEV | not listed |
NVD description
IBM Langflow OSS 1.0.0 through 1.11.2 Langflow could allow an authenticated attacker to write arbitrary files to the server due to improper input validation in the SaveToFileComponent. The application constructs local file paths using attacker‑controlled input without sufficient sanitization when handling requests to the /api/v1/run/{flow_id} endpoint. An attacker with low‑privileged authenticated access (such as a valid API key or user session) can supply crafted path values, including absolute paths or path traversal sequences, allowing arbitrary file writes to locations writable by the Langflow process. Successful exploitation may lead to unauthorized file creation or modification, potentially resulting in further compromise depending on the deployment environment.
What to do
- Upgrade Langflow to
1.11.3or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
Read more
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