A series of issues in Apple’s web browser engine — the tech underlying all browsers on iOS — means that Apple’s iCloud Private Relay tool, which is supposed to hide a user’s IP address, in many cases doesn’t actually work. Instead, the issues mean a malicious attacker can set up a website to learn a Private Relay user’s real IP address, or that many websites have also already collected this information incidentally. The issues also impact OnionBrowser, an iOS app for browsing the web through the...