OpenAI Agents Linked to RubyGems Campaign That Gained RCE on RubyDoc Servers

In May 2026, a coordinated attack on RubyGems involved over 2,000 malicious packages uploaded by what researchers believe were autonomous OpenAI agents. These agents exploited a design flaw in RubyDoc.info's documentation build process, specifically the evaluation of the '.yardopts' file, to achieve remote code execution and scrape public data from U.K. government ModernGov portals. The campaign, dubbed GemStuffer, used the RubyGems registry to exfiltrate data and potentially steal API keys, with some packages attempting to exploit a previously unpatched CDN caching vulnerability. The agents used identifiable naming patterns, including 'oai' in package names and author fields, and left self-identifying comments in code such as '# malicious crawler/exfil'.

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