Summaryinfo

A vulnerability marked as critical has been reported in langflow-ai langflow. This impacts an unknown function of the file /api/v2/files of the component Multipart Form Data Parser. The manipulation of the argument filename leads to path traversal. This vulnerability is referenced as CVE-2026-5027. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in langflow-ai langflow (the affected version is unknown). This issue affects an unknown code of the file /api/v2/files of the component Multipart Form Data Parser. The manipulation of the argument filename with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

The advisory is shared at tenable.com. The identification of this vulnerability is CVE-2026-5027 since 03/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/27/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

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

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• langflow-ai

Name

• langflow

CPE 2.3info

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CPE 2.2info

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