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Modelling for Agentic Failure; when attack trees meet safety engineering
Friday November 6, 2026 11:30am - 12:15pm PST
Room: Grand Ballroom C (Street Level)
Security and engineering teams are leaner in 2026, while the agents they're securing keep scaling. We're handing agents more tasks and more reach, which means when they fail, they fail exponentially. Threat modelling tells you what could go wrong, the next step is to decide which few controls or tests actually stop the disaster you want to prevent.

This talk brings threat models together with safety engineering with the mission of a more data driven approach to securing complex and / or agentic systems. Starting from a single Top Event, FTA models failure as explicit chains of conditions. By modelling OR / AND branches and minimal cut sets you can identify test cases, derive probabilities or understand better which controls to prioritise. Threat modelling and attack trees tell you the routes to a bad outcome while FTA tells you which of those routes to close first, and how to test if you've closed them. Pairing the two gives you agents that fail safely and predictably, and a defensible way to justify where your limited security time goes. Using illustrative examples from the cult movie 2001: A Space Odyssey in this talk we'll walk through translating fault paths into prioritised controls and focused tests.

The audience will take away how pairing FTA-driven testing and prioritisation with threat modelling and attack trees closes the loop that helps us build systems and agents that can fail safely and predictably.
Speakers
avatar for Petra Vukmirovic

Petra Vukmirovic

Head of Information Security and Fractional Head of Product, Numan and Devarmor
Petra is a technology enthusiast, leader and public speaker. A former emergency medicine doctor and competitive volleyball athlete, she thrives in challenging environments and loves creating order from chaos. Initially pursuing a medical career, Petra's passion for technology led... Read More →
Friday November 6, 2026 11:30am - 12:15pm PST
Room: Grand Ballroom C (Street Level)
  Planning and Design

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