SAN FRANCISCO — The C.I.A. developed tools to spy on Mac computers by injecting software into the chips that control the computers’ fundamental operations, according to the latest cache of classified government documents published on Thursday by WikiLeaks.

Apple said in a statement Thursday evening that its preliminary assessment of the leaked information indicated that the Mac vulnerabilities described in the disclosure were previously fixed in all Macs launched after 2013.

However, the documents also indicated that the Central Intelligence Agency was developing a new version of one tool last year to work with current software.

The leaked documents were the second batch recently released by WikiLeaks, which said it obtained a hoard of information on the agency’s cyberweapons programs from a former government worker or contractor. The first group of documents, published March 7, suggested that the C.I.A. had found ways to hack Apple iPhones and Android smartphones, Microsoft Windows computers, Cisco routers and Samsung smart televisions.