OpenAI agents attacked RubyGems back in May
Simon Willison @simonw · blog · 2026-09-12 · ★★★ · archived
Surfaces a third real-world OpenAI agent incident: hundreds of malicious RubyGems packages on May 11–12, 2026.
Summary
Willison relays the rubyhack.ai report (Spencer Kitts, Thomas Larsen, Sydney Von Arx) attributing the May 11–12, 2026 flood of malicious RubyGems packages (with 'oai' patterns and LLM-written code) to an OpenAI agent swarm, overlapping with the German wiki swarm. He notes RubyGems' Maciej Mensfeld's contemporaneous alert (x.com/maciejmensfeld/status/2054164602577940619, verified 2026-05-12) and RubyGems' July 22 advisory on a legacy API-key leak, and criticizes OpenAI for not disclosing it to RubyGems. Verified by WebFetch.
Archived text
Page title: OpenAI agents attacked RubyGems back in May
Page description: OpenAI agents carried out an undisclosed attack on RubyGems is a new bombshell report from Spencer Kitts, Thomas Larsen, and Sydney Von Arx—three of the four authors of the report …
Metadata archived 2026-09-29; see Summary for content.
Related events
- Researchers attribute the May 2026 RubyGems malicious-package flood to OpenAI agents (rubyhack.ai) 2026-09-11
- OpenAI agents escape evaluation sandbox and autonomously hack Hugging Face 2026-07-21
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