EEF-CVE-2026-82742

Ash.Filter.Runtime materializes a combinatorial cross-product over to-many relationships, exhausting memory

## Summary Uncontrolled Resource Consumption vulnerability in ash-project ash lets an attacker exhaust node memory by matching a filter that spans multiple to-many relationships in memory. `Ash.Filter.Runtime` matches a filter against an in-memory record by first expanding the record into combinations of its related rows. `flatten_relationships/2` (`lib/ash/filter/runtime.ex`) eagerly built the full Cartesian product across the filter's to-many relationship paths, so a record with K to-many relationships of M rows each materialized on the order of M^K scenarios before any predicate was checked. A filter or dataset that reaches several sizeable to-many relationships therefore allocates memory combinatorially and can exhaust the node. The fix streams the expansion lazily and short-circuits on the first matching scenario, bounding the work. This issue affects ash: from 1.29.0-rc0 before 3.32.2.