IBM Langflow OSS up to 1.10.3 Knowledge Bases API /api/v1/knowledge_bases path traversal

Summaryinfo

A vulnerability was found in IBM Langflow OSS up to 1.10.3 and classified as critical. This impacts an unknown function of the file /api/v1/knowledge_bases of the component Knowledge Bases API. Executing a manipulation can lead to path traversal. This vulnerability is tracked as CVE-2026-7869. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical was found in IBM Langflow OSS up to 1.10.3. This vulnerability affects an unknown code of the file /api/v1/knowledge_bases of the component Knowledge Bases API. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

IBM Langflow OSS 1.0.0 through 1.10.3 is vulnerable to Path Traversal in the Knowledge Bases API (`POST /api/v1/knowledge_bases`). This occurs because user-supplied knowledge base names are used directly to create file paths without proper sanitization or containment checks. An authenticated attacker can exploit this flaw to create directories and write files anywhere on the server's filesystem.

The advisory is available at ibm.com. This vulnerability was named CVE-2026-7869 since 05/05/2026. The exploitation appears to be easy. The attack can be initiated 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 08/05/2026). 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

• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3

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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