New WikiLeaks documents point to an apparent CIA program to hack Apple's iPhones and Mac computers.
Security experts say the exploits are plausible but suggest they pose little threat to typical users.
They say many of the tricks are older - the iPhone hack involves the 3G model from 2008, for instance.
The techniques also typically require physical access to devices, something the CIA would use only for targeted individuals, not a broader population.
Apple has not responded to a request for comment.
The CIA has not commented on the authenticity of this and earlier WikiLeaks revelations but has previously said it complied with a legal prohibition against electronic surveillance "targeting individuals here at home, including our fellow Americans".
The agency declined further comment on Thursday.
The leaks come about two weeks after WikiLeaks published thousands of alleged CIA documents describing hacking tools it said the government employed to break into computers, mobile phones and even smart TVs.
The latest disclosures are much more focused and consist of just 12 documents, all involving Apple products.
The documents describe techniques for rewriting devices' firmware in ways that would maintain a hacker's access even if a user resets a phone or computer to factory settings.
A December 2008 document describes "NightSkies," a tool apparently designed to target the iPhone 3G; the document claims it can retrieve files such as contact lists and call logs and execute other commands.
Other documents released describe similar exploits for Mac computers.
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