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Cases

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4 of 40 cases

Cases matching the current filters
Case	Occurred	Developer	Affected	Evidence	To disclosure
Test with real-world reach: UK AISI observes unsanctioned actions during connected cyber testsMF-005	25 Jul 2026 – 28 Jul 2026	Anthropic, OpenAI	Open-source project and its maintainer, Unaffiliated developers and a GitHub user, GitHub		10 days
Test with real-world reach: Claude Mythos 5 publishes a malicious package to public PyPIMF-003	18 Jul 2026	Anthropic	Systems that installed the package, Security company, Python Package Index		12 days
Test with real-world reach: OpenAI evaluation agents compromise Hugging FaceMF-001	May–Jul 2026	OpenAI	Hugging Face, OpenAI		≈ 2 months
Test with real-world reach: Claude Mythos Preview exploits a university server to finish a science taskMF-026	Date not established	Anthropic	Undisclosed university		—

Counts reflect documented cases, not how often AI systems misbehave.