CVE-2026-82742: Ash-Project Ash

Medium severity, CVSS 5.9. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Ash-Project Ash: from 1.29.0-rc0, before 3.32.2 (fixed in 3.32.2)

Published 2026-09-01. Last modified 2026-09-01.