The July 2026 US Department of Homeland Security DeepSeek order noted that DeepSeek's servers are in China, where the legal system lets government cyber and intelligence agencies access private company infrastructure

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US orders civilian federal agencies to remove Chinese AI company DeepSeek and stop buying its products over national security risks

The US Department of Homeland Security warned in July 2026 that US government use of DeepSeek may result in the transfer of sensitive data to China

The US Department of Homeland Security said in July 2026 that Chinese AI company DeepSeek's models may contain malware or other security vulnerabilities

In October 2026, the US Department of Homeland Security ordered civilian federal agencies to remove DeepSeek products from their IT systems

The US Department of Homeland Security order banning DeepSeek from civilian federal agencies was dated July 24, 2026 and signed by Homeland Security Secretary Markwayne Mullin

In October 2026, the US Department of Homeland Security barred civilian federal agencies from buying DeepSeek products or third-party services built using DeepSeek

The US Department of Homeland Security said in July 2026 that government use of DeepSeek could produce actionable intelligence on US persons and government programs

The US Department of Homeland Security issued its DeepSeek ban as Exclusion and Removal Order #2026-01 under the Federal Acquisition Supply Chain Security Act of 2018

The US civilian federal agency ban on DeepSeek took effect in July 2026, nearly three months before the US Department of Homeland Security made it public on October 19, 2026

New York, Tennessee and Virginia restricted Chinese AI company DeepSeek on state government devices before the 2026 US federal civilian agency ban

The July 2026 US Department of Homeland Security DeepSeek order encouraged agencies to monitor traffic and add data exfiltration controls until DeepSeek products were fully removed

Before October 2026, the US Commerce Department and the US Navy had already banned Chinese AI company DeepSeek on government devices

Under the July 2026 US Department of Homeland Security DeepSeek order, civilian federal agencies had 60 days to request written exceptions, reviewed by CISA

The US Department of Homeland Security said in July 2026 that DeepSeek's account sign-up process collects personally identifiable information and may track and digitally fingerprint users

The July 2026 US Department of Homeland Security DeepSeek order did not apply to civilian agencies' national security systems or secure compartmented information systems

The 2026 US federal ban on DeepSeek applied to civilian agencies such as the Treasury, State and Justice departments but not to Pentagon agencies

The US Department of Homeland Security's July 2026 DeepSeek order cited security research finding multiple critical vulnerabilities in DeepSeek's iOS app

Chinese AI models pose security risks