First Public macOS M5 Kernel Exploit Built with Anthropic Mythos in 5 Days — Bypasses Memory Integrity Enforcement

Calif.io·high signal

Calif, a Vietnam-based security startup, used Anthropic's Mythos preview to discover two kernel memory-corruption bugs in macOS 26.4.1. Three human researchers then chained them into a local privilege escalation exploit bypassing Apple M5's Memory Integrity Enforcement. What typically takes months of vulnerability research compressed into a 5-day sprint against the strongest consumer memory defense ever shipped. Apple is reviewing; full writeup withheld until patch.