CVE-2026-33053

Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the delete_api_key_route() endpoint accepts an api_key_id path parameter and deletes it with only a generic authentication check (get_current_active_user dependency). However, the delete_api_key() CRUD function does NOT verify that the API key belongs to the current user before deletion.

An attacker registers or compromises any low-privilege account in a multi-tenant Langflow deployment. They enumerate API key IDs by making sequential or pattern-based requests to the delete endpoint (e.g., DELETE /api/v1/api_keys/1, /2, /3...). Because the backend performs no ownership verification, the server deletes keys belonging to admins and other users without error. The attacker can systematically revoke all API keys in the system, causing immediate outages across all AI workflows, agent pipelines, and LLM integrations — effectively a targeted DoS on the organization's entire AI infrastructure. A more targeted variant would selectively delete only admin API keys while preserving their own access.