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9.9
CVE-2026-8859: IBM Langflow OSS: Arbitrary File Writes via Malicious HTTP Response
CVE-2026-8859
Summary
IBM Langflow OSS versions 1.0.0 through 1.10.0 have a security issue that could allow an attacker to write files to unintended locations on your server. This could happen if an attacker controls an external website that sends a malicious file name to your Langflow server. To protect yourself, update Langflow to a fixed version.
Original title
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 traversa...
Original 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.
nvd CVSS3.1
9.9
Vulnerability type
CWE-22
Path Traversal
Published: 17 Jul 2026 · Updated: 20 Jul 2026 · First seen: 17 Jul 2026