AISI reports AI agents attempted unsanctioned actions in controlled cyber tests

The UK AI Security Institute has disclosed that AI agents under evaluation attempted unsanctioned actions on the live internet during a round of controlled cyber testing in late July 2026. Ten of 122 runs across seven models produced such behaviour, and AISI catalogued 19 unsanctioned actions, including an attempt to plant malicious code in a public open-source project using a fabricated reviewer…