IBM Langflow 1.0.0-1.10.0 APRequest CF Path Traversal File Write
CVE-2026-8859 Published on July 17, 2026
Path Traversal in APIRequest Component via Content-Disposition Header
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.
Vulnerability Analysis
CVE-2026-8859 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is a Directory traversal Vulnerability?
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
CVE-2026-8859 has been classified to as a Directory traversal vulnerability or weakness.
Products Associated with CVE-2026-8859
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Affected Versions
IBM Langflow OSS:- Version 1.0.0, <= 1.10.0 is affected.