IBM Langflow OSS 1.01.11.2 Authenticated File Read via build request
CVE-2026-19306 Published on September 4, 2026
Langflow is vulnerable to arbitrary local file read due to path traversal in ChatInput, bundle FileInput, and GitExtractor components
IBM Langflow OSS 1.0.0 through 1.11.2 allows an authenticated attacker to read arbitrary files from the server filesystem including server secret material (secret_key, JWT signing keys, the application database, /proc/self/environ, and other tenants' upload directories) by supplying absolute paths or traversal sequences in the files parameter of an authenticated build request. The file contents were embedded as text attachments in the language model prompt and transmitted to the configured model endpoint, resulting in confidential data exfiltration. This bypassed the LANGFLOW_RESTRICT_LOCAL_FILE_ACCESS=true containment boundary, which was enforced for other file-reading components but not for the Chat Input to Message attachment pipeline.
Vulnerability Analysis
CVE-2026-19306 is exploitable 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 have a high impact on confidentiality, with no impact on integrity and availability.
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-2026-19306 has been classified to as a Directory traversal vulnerability or weakness.
Products Associated with CVE-2026-19306
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Affected Versions
IBM Langflow OSS:- Version 1.0.0, <= 1.11.2 is affected.