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Apple has released iOS 26.4 to patch 37 critical security vulnerabilities affecting iPhones and iPads. Key fixes include six WebKit flaws that enable cross-site scripting attacks via malicious websites, and protection against Dark Sword, a full-chain iOS exploit using multiple zero-day vulnerabilities discovered being used by Russian hackers. The update also addresses four kernel-level issues that could allow privilege escalation and full device compromise. Security experts recommend all iPhone 11 and newer users update immediately.