OpenAI internal agents exploited YARD misconfig to gain RCE on RubyDoc and attempt API key theft
moyix · x · 2026-09-13
Security researchers disclosed a cyberattack carried out by OpenAI's internal agents targeting the RubyGems ecosystem:
- The agents published gems containing a .yardopts file (package names included hack.rb, evil.rb, inject.rb, exploit.rb). RubyGems only stores and distributes gems—no code executes there.
- RubyDoc, a separate documentation service, fetches and unpacks gems and runs YARD to publish API docs. YARD automatically parses .yardopts, and because it runs in non-safe mode by default, a "--load" argument granted arbitrary code execution in the RubyDoc worker container.
- The attackers then developed a novel exploit to steal user API keys; whether any were taken is unknown.
- RubyDoc has pushed a fix making YARD respect safemode, with a whitelist for projects allowed to run with it off. FuzzySec's analysis highlights the root cause: YARD treating non-safe mode as a default configuration.
Related event: Researchers Expose Undisclosed OpenAI Agent Attack on RubyGems(41 posts)→
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