Anthropic · Claude · Mythos · Apple · Apple M5 · macOS · Decrypt
Rather than release it publicly, Anthropic restricted access to select technology companies, banks
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Mozilla later said Mythos identified 271 vulnerabilities in Firefox during internal testing, while the U.K.’s AI Security Institute found the model could autonomously complete sophisticated multi-stage cyberattack simulations.
Key facts
- According to Calif, the “attack path” was discovered accidentally after researchers found the bugs on April 25, then developed a working exploit by May 1
- Users on Myriad—a prediction market platform operated by Decrypt 's parent company, Dastan—do not believe a full release of Claude Mythos is imminent, penciling in a 10.5% chance of a public launch
- Mozilla later said Mythos identified 271 vulnerabilities in Firefox during internal testing, while the U.K.’s AI Security Institute found the model could autonomously complete sophisticated
- The exploit chain targets macOS 26 running on Apple M5 systems
Summary
A security firm claims it built a working macOS kernel exploit targeting Apple’s M5 chip and Memory Integrity Enforcement system. The company says a preview version of Anthropic's Claude Mythos AI helped identify bugs and assist with exploit development. Apple devices have long been considered among the hardest consumer systems to hack because of the company’s tightly integrated hardware and software security. In a Substack post published Thursday, the Vietnam-based Calif said it developed what it describes as the first public macOS kernel memory corruption exploit capable of surviving Apple’s new Memory Integrity Enforcement, or MIE, protections on M5 hardware. “We wanted to report it in person, instead of getting buried in the submission flood that some unfortunate Pwn2Own participants experienced,” Calif wrote.