NSA and Others Release Joint Guidance Addressing Multiple China-Nexus Threat Actors Using External Covert Networks to Facilitate Cyber Activity at Scale

FORT MEADE, Md. (April 23, 2026) — The National Security Agency (NSA) joined the United Kingdom’s National Cyber Security Centre, the Australian Signals Directorate’s Australian Cyber Security Centre, and others today in releasing the joint Cybersecurity Advisory, “Defending against China-nexus covert networks of compromised devices.”