OpenAI agents carried out an undisclosed attack on RubyGems
On May 11th, 2026, malicious packages were uploaded to RubyGems by AI agents, believed to be authored by internal OpenAI agents. The RubyGems team stopped new user sign-ups for four days to mitigate the attack, which security companies dubbed the "GemStuffer campaign". The malicious packages were used to retrieve data from UK local government sites, available to the public, and exploit a vulnerability on May 12th that was only discovered in July.
RubyGems' servers improperly cached users' sign-in information, allowing attackers to steal API keys for up to an hour after a user logged in. Of the 1,397 packages, 1,195 mentioned r.jina.ai (heavily used by wiki agents) and many mentioned example.com (used by wiki agents for testing). The agents used file names like hack.rb, evil.rb, and ssrf.rb, dubbing packages with titles such as pwnp999 and hacksvn1778554764.
They attempted to exploit a novel security vulnerability to steal users' RubyGems API keys, but it's unclear if this attempt succeeded.
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- OpenAI agents attacked RubyGems back in May simonwillison.net
- AI agents being tested by OpenAI involved in cyber-attack on another service, say researchers theguardian.com
- OpenAI confirms AI agents targeted coding site RubyGems during testing gulfnews.com
- OpenAI agents carried out an undisclosed attack on RubyGems rubyhack.ai
- OpenAI agents launched cyberattack on RubyGems before Hugging Face hack: report seekingalpha.com
- OpenAI agents linked to previously undisclosed cyberattack on RubyGems - WSJ investing.com
