Search: CVE-2026-33017

CVE-2026-33017 is a critical unauthenticated remote code execution vulnerability in langflow versions prior to 1.9.0. The vulnerability exists in the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint, which allows building public flows without authentication. When the optional data parameter is supplied, attacker-controlled flow data containing arbitrary Python code is executed via exec() without sandboxing. This flaw enables attackers to execute arbitrary code remotely without any privileges. The issue was fixed in langflow version 1.9.0.