IBM Langflow OSS up to 1.11.2 Chat Input to Message Attachment Pipeline files path traversal

Summaryinfo

A vulnerability classified as problematic was found in IBM Langflow OSS up to 1.11.2. This vulnerability affects unknown code of the component Chat Input to Message Attachment Pipeline. The manipulation of the argument files results in path traversal. This vulnerability is cataloged as CVE-2026-19306. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in IBM Langflow OSS up to 1.11.2. Affected is an unknown function of the component Chat Input to Message Attachment Pipeline. The manipulation of the argument files with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product 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 product 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. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is available at ibm.com. This vulnerability is traded as CVE-2026-19306 since 08/07/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/04/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• IBM

Name

• Langflow OSS

Version

• 1.11.0
• 1.11.1
• 1.11.2

License

• commercial

Website

• Vendor: https://www.ibm.com/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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