ash-project ash up to 3.32.1 runtime.ex flatten_relationships resource consumption

Summaryinfo

A vulnerability labeled as problematic has been found in ash-project ash up to 3.32.1. This affects the function flatten_relationships of the file lib/ash/filter/runtime.ex. Such manipulation leads to resource consumption. This vulnerability is documented as CVE-2026-82742. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in ash-project ash up to 3.32.1 and classified as problematic. Affected by this issue is the function flatten_relationships of the file lib/ash/filter/runtime.ex. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-82742 since 08/31/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 3.32.2 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ash-project

Name

• ash

Version

• 3.32.0
• 3.32.1

Website

• Product: https://github.com/ash-project/ash/

CPE 2.3info

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CPE 2.2info

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