langflow-ai langflow up to 1.8.1 Incomplete Fix CVE-2025-68478 /api/v2/files/ path traversal

Summaryinfo

A vulnerability labeled as critical has been found in langflow-ai langflow up to 1.8.1. Affected by this vulnerability is an unknown functionality of the file /api/v2/files/ of the component Incomplete Fix CVE-2025-68478. Executing a manipulation can lead to path traversal. This vulnerability is handled as CVE-2026-33309. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in langflow-ai langflow up to 1.8.1. It has been declared as critical. This vulnerability affects an unknown part of the file /api/v2/files/ of the component Incomplete Fix CVE-2025-68478. 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:

Langflow is a tool for building and deploying AI-powered agents and workflows. Versions 1.2.0 through 1.8.1 have a bypass of the patch for CVE-2025-68478 (External Control of File Name), leading to the root architectural issue within `LocalStorageService` remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer `ValidatedFileName` dependency. This defense-in-depth failure leaves the `POST /api/v2/files/` endpoint vulnerable to Arbitrary File Write. The multipart upload filename bypasses the path-parameter guard, allowing authenticated attackers to write files anywhere on the host system, leading to Remote Code Execution (RCE). Version 1.9.0 contains an updated fix.

The advisory is available at github.com. This vulnerability was named CVE-2026-33309 since 03/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 1.9.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• langflow-ai

Name

• langflow

Version

• 1.8.0
• 1.8.1

Website

• Product: https://github.com/langflow-ai/langflow/

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