Vulnerability Description
IBM Langflow OSS 1.0.0 through 1.10.0 Langflow could allow an attacker to write arbitrary files to unintended locations due to improper input validation in the APIRequest component. A path traversal vulnerability exists when the "Save to File" feature is enabled, where filenames extracted from HTTP response Content-Disposition headers are not sanitized before being joined to the temporary directory path. An attacker controlling an external HTTP server can supply crafted filename values containing path traversal sequences (e.g., ../), enabling arbitrary file writes to locations accessible by the Langflow process.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Langflow | Langflow | >= 1.0.0, < 1.10.1 |
| Apple | Macos | - |
| Linux | Linux Kernel | - |
| Microsoft | Windows | - |
Related Weaknesses (CWE)
References
- https://www.ibm.com/support/pages/node/7278924Vendor Advisory
FAQ
What is CVE-2026-8859?
CVE-2026-8859 is a vulnerability with a CVSS score of 9.9 (CRITICAL). IBM Langflow OSS 1.0.0 through 1.10.0 Langflow could allow an attacker to write arbitrary files to unintended locations due to improper input validation in the APIRequest component. A path traversal v...
How severe is CVE-2026-8859?
CVE-2026-8859 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-8859?
Check the references section above for vendor advisories and patch information. Affected products include: Langflow Langflow, Apple Macos, Linux Linux Kernel, Microsoft Windows.