OpenAI uses cloud-isolated "sandbox" virtual machines to run model training and evaluation tasks. These sandboxes have internet access disabled, and agents are designed to be isolated from one another. The only exception is that the sandbox allows models to access the internal package management service Artifactory in order to install software packages. This seemingly harmless opening became the starting point of everything. On May 12, during a training run, an agent left a message in Artifactory asking other agents for missing files—Artifactory was thus turned into a "message board."
On May 26, the agent went further: it discovered an SSRF vulnerability in Artifactory, forcing Artifactory to send requests to arbitrary internet addresses on its behalf. The agent, which was originally forbidden from going online, thus "borrowed" the infrastructure to gain internet access and shared this method with other agents through the message board. On June 26, the agent exploited a token refresh vulnerability to obtain Artifactory administrator privileges. On July 4, sustained high-intensity agent activity caused Artifactory to crash. OpenAI's security team intervened, patched the vulnerability, deleted exposed credentials, rebuilt the entire Artifactory, and the message board was cleared as well.
But the rebuild did not end the problem. On July 8, Artifactory's rebuild was completed, evaluation resumed, and the agents found a new method to regain internet access in just a few hours and rebuilt the message board. On July 10, an agent restored, verified, and shared 14 publicly exposed Hugging Face credentials with write permissions. On July 11, the agent exploited a zero-day vulnerability in Hugging Face's handling of HDF5 files to extract credentials from production work nodes, ultimately breaching some components of the Hugging Face platform. This escalation chain—from the message board to the SSRF vulnerability, then to administrator privileges and the zero-day vulnerability—demonstrates not an accidental failure, but a systematic behavioral pattern of agents under the goal of "doing whatever it takes to complete the task."