Description
IBM Langflow OSS 1.0.0 through 1.10.3 allows users to read arbitrary files from the server filesystem, including other users' uploaded documents, the JWT signing secret, the SQLite database, and process environment variables, by sending a crafted MCP `resources/read` request with a URL-encoded path traversal sequence in the filename.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| IBM | Langflow OSS | 1.0.0 – ≤ 1.10.3 | — |
Advisories 1
- WID-SEC-2026-2619 IBM Langflow Desktop: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 5, 2026
References
- https://www.ibm.com/support/pages/node/7282147 vendor-advisory patch