# CVE-2026-33017

> Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allows building public flows without requiring authentication. When the optional data parameter is supplied, the endpoint uses attacker-controlled flow data (containing arbitrary Python code in node definitions) instead of the stored flow data from the database. This code is passed to exec() with zero sandboxing, resulting in unauthenticated remote code execution. This is distinct from CVE-2025-3248, which fixed /api/v1/validate/co

- **CVSS:** 9.8 (CRITICAL)
- **EPSS:** 5.7%
- **CISA KEV:** yes
- **CWE:** CWE-94, CWE-95, CWE-306

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-33017
Full threat coverage + IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp