A Chinese industry regulator warned users on Wednesday of a “security backdoor” embedded in versions of US artificial intelligence company Anthropic’s coding tool, Claude Code.

The alleged backdoor could allow the software to “transmit sensitive information”, including users’ locations and identity-related identifiers, back to Anthropic’s servers without users’ consent, said China’s National Vulnerability Database (NVDB), a cybersecurity platform.

Claude Code is an AI coding agent that can generate computer code, debug software and review code based on user prompts.

San Francisco startup Anthropic blocks users and companies in China and other nations it deems adversarial from accessing its products, but it is still possible to use them in the country through a VPN or third-party proxy services.

The NVDB, which is affiliated with China’s Ministry of Industry and Information Technology, said on its website that it had recently “detected that the AI coding tool Claude Code contains security backdoor risks, posing a severe threat”.

Anthropic has not responded to AFP requests for comment on the allegations, which first emerged in specialist tech media last week.

The NVDB advised relevant institutions and users “to conduct a comprehensive check immediately” and “promptly uninstall or upgrade to the latest secure version from which the relevant backdoor code has been removed”.

It also urged organisations to strengthen network traffic monitoring to prevent the unauthorised leakage of sensitive data.

Chinese tech giant Alibaba told employees last week that the use of Claude Code would be banned from July 10 due to security concerns, people familiar with the matter said.

Anthropic has previously accused Alibaba of reverse-engineering its AI models to mimic their abilities in a process known as “distillation”.

Claude Code engineer Thariq Shihipar responded in an X post last week to reports alleging that the tool was tracking certain data from Chinese users.

“This is an experiment we launched in March that was meant to prevent account abuse from unauthorised resellers and protect against distillation,” Shihipar wrote.

“The team has landed stronger mitigations since then and we’ve actually been meaning to take this down for a while… this should be fully rolled back in tomorrow’s release.”