CVE-2026-82742 - Ash.Filter.Runtime materializes a combinatorial cross-product over to-many relationships, exhausting memory

CVE-2026-82742 - Ash.Filter.Runtime materializes a combinatorial cross-product over to-many relationships, exhausting memory

https://cvefeed.io/rssfeed/latest.atom / Tue, 09/01/2026 - 07:29
CVE ID :CVE-2026-82742
Published : Sept. 1, 2026, 4:18 a.m. | 13 minutes ago
Description :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.
Severity: 5.9 | MEDIUM
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