Apple dyld Zero-Day (CVE-2026-20700): Technical Breakdown of the Kernel-Level Bypass

The First Major Zero-Day of 2026

Apple has patched a critical memory corruption vulnerability in dyld (the dynamic linker) that allowed for complete system compromise on iOS 26 and macOS Tahoe...

The Vulnerability: Use-After-Free in Shared Cache

The flaw, tracked as CVE-2026-20700, exists in the way dyld handles the shared cache during process initialization. * Exploit Vector: An attacker could use a malformed Mach-O binary to trigger a use-after-free condition before System Integrity Protection (SIP) was fully engaged. * Targeting: Security researchers at BleepingComputer noted that this exploit was being utilized in highly targeted campaigns against high-value technical assets.

Security Hardening in macOS 26.3

Apple's patch introduces 'Pointer Integrity' checks for the shared cache metadata, making the heap spray required for this exploit significantly more difficult to execute reliably.