CVE-2026-8859 Path Traversal in APIRequest Component via Content-Disposition Header
Attackers can write arbitrary files via path traversal in the Save to File feature when enabled, requiring patching of Langflow OSS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8859?
CVE-2026-8859 is a critical path traversal vulnerability in Langflow Langflow, published on 17 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-8859?
It affects 1 product.
Products include Langflow Langflow.
How do I fix CVE-2026-8859?
No fix has been published for CVE-2026-8859 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-8859 being exploited?
There is no known exploitation of CVE-2026-8859 in the wild and no public exploit code.
Other vulnerabilities in Langflow Langflow
Sources
Also known as GHSA-mvq6-wcf9-wpxf.