Attackers exploit critical Langflow RCE within hours as CISA sounds alarm

Attackers exploited a critical vulnerability (CVE-2026-33017) in Langflow, an open-source tool for building AI pipelines, within hours of its public disclosure, allowing them to run arbitrary code on unprotected systems without credentials. The flaw stems from an exposed API endpoint that accepts malicious Python code in workflow data and executes it without sandboxing or authentication checks. CISA added it to its Known Exploited Vulnerabilities catalog and urged federal agencies to patch by April 8, 2026.