GHSA-g2j9-7rj2-gm6c: Langflow has an Arbitrary File Write (RCE) via v2 API

Summary

GHSA-g2j9-7rj2-gm6c reports an Arbitrary File Write in Langflow via the POST /api/v2/files/ endpoint. The multipart upload filename is passed unchecked to LocalStorageService, which lacks a containment check, so an authenticated attacker can write files anywhere on the host, potentially leading to Remote Code Execution. The reporter tested this against langflowai/langflow:latest (v1.7.3).

Mitigation

Sanitize the multipart filename before processing by stripping directory components with pathlib's name attribute and rejecting empty names or names containing ".." with HTTP 400. Also add a canonical path containment check inside LocalStorageService.save_file.

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

• langflowPyPIReaches an LLM package through dependencies

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