Audited DeFi protocols lost $885M to attacks that occurred completely outside their audit scopes

In decentralized finance, “audited” is often presented as a verdict on an entire project. In practice, an audit usually covers named code, components and versions at a particular point in time. Anything added, excluded or operated around that boundary may carry a different level of assurance.

A new preprint puts a number on that gap. Researchers affiliated with security company ack3 and the Czech Technical University in Prague examined 135 reported incidents from the first half of 2026, with $939.86 million in attributed losses. They found identifiable public pre-incident audits for 68 incidents.

Within that 68-incident subset, the authors classified 46 attack paths as outside every audit scope they could identify, 20 as inside at least one scope and two as unresolved. The outside-scope group represented 67.6% of the incidents but 94.4% of their reported losses.

That striking percentage is not an estimate of audit effectiveness or proof that an audit’s boundaries caused a loss. It describes the distribution of losses in a selected set of reported incidents. Two large cases also dominate it: after excluding $292 million at Kelp DAO and $285 million at Drift Protocol, the outside-scope share falls to 72.1% of losses in the same audited-incident subset.

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