IBM Langflow OSS up to 1.11.2 SaveToFileComponent path traversal

Summaryinfo

A vulnerability was found in IBM Langflow OSS up to 1.11.2 and classified as problematic. Affected by this issue is some unknown functionality of the component SaveToFileComponent. The manipulation results in path traversal. This vulnerability is known as CVE-2026-9138. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in IBM Langflow OSS up to 1.11.2. It has been classified as problematic. Affected is an unknown code of the component SaveToFileComponent. The manipulation 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 integrity, and availability. CVE summarizes:

IBM Langflow OSS 1.0.0 through 1.11.2 Langflow could allow an authenticated attacker to write arbitrary files to the server due to improper input validation in the SaveToFileComponent. The application constructs local file paths using attacker‑controlled input without sufficient sanitization when handling requests to the /api/v1/run/{flow_id} endpoint. An attacker with low‑privileged authenticated access (such as a valid API key or user session) can supply crafted path values, including absolute paths or path traversal sequences, allowing arbitrary file writes to locations writable by the Langflow process. Successful exploitation may lead to unauthorized file creation or modification, potentially resulting in further compromise depending on the deployment environment.

The advisory is available at ibm.com. This vulnerability is traded as CVE-2026-9138 since 05/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available. 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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