AI Daily · Oct 31, 2026 · Saturday
GLM 5.3 autonomously builds full Firefox exploit chain with zero human input
AI summary
Epoch AI found that the open-weight model GLM 5.3 can autonomously build a full exploit chain against six Firefox versions released between 17 September and 26 October, during the window between a patch's release and users updating, at an API cost of about $1 per successful attack. On the same day, Alphabet, Amazon, Meta and Microsoft's combined planned capital expenditure for this year exceeded $740 billion, with investors beginning to worry about negative free cash flow and return prospects.
Industry
Cracks are emerging in the AI spending boom
Big Tech is pouring billions into AI infrastructure, but mounting debt, negative cash flow, and growing investor skepticism are raising questions about the sustainability of the AI spending boom.
Research
Open-weight model GLM 5.3 built full Firefox exploit chains with zero human input in under 48 hours
Epoch AI researchers say the widely available AI model GLM 5.3 turned public security fixes into working exploits before updates reached Firefox users. It autonomously compromised six Firefox releases for about $1,000 in API fees each without triggering safeguards from any provider tested.