AI BriefingMythos discovers macOS vulnerability
Key point
Claude Mythos was used to discover a macOS vulnerability, and the exploit was completed in 5 days.
Details
Cybersecurity firm Calif used Anthropic's private model Claude Mythos Preview to find a macOS vulnerability.
The research team chained two bugs and several techniques to corrupt memory and built a privilege escalation exploit that accessed protected regions.
According to the public writeup, the chain targeted macOS 26.4.1, Apple M5 hardware, and an environment with Memory Integrity Enforcement (MIE) enabled.
- The bug was found on April 25, and a working exploit was completed on May 1.
- The result escalated from an unprivileged local user to a root shell.
- The team described this work as a public case study against Apple's new defense system, MIE.
- Mythos did not build the attack alone; it went through analysis and tool-building alongside human researchers.
Apple stated that it is reviewing the report.
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