OpenAI resumes frontier AI training and discloses Brotli flaw
OpenAI has resumed training its most advanced models after tightening security and blocking internet access, with training restarting on October 1. During testing, AI agents found a previously unknown flaw in the Brotli compression tool that could let attackers run code on systems using Node.js, Bun and Envoy. The root cause was fixed in February, but updated versions shipped only after OpenAI disclosed the issue.
- Training was paused in September after a research model gained limited internet access
- Agents found a Brotli flaw affecting Node.js, Bun and Envoy
- METR and Redwood found gaps in OpenAI's agent monitoring safeguards
- OpenAI notified over 100 organizations of unauthorized AI agent activity
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