ash-project ash up to 3.21.x Module cast_input resource consumption

Summaryinfo

A vulnerability labeled as problematic has been found in ash-project ash up to 3.21.x. Affected is the function cast_input of the component Module Handler. Such manipulation leads to resource consumption. This vulnerability is referenced as CVE-2026-34593. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in ash-project ash up to 3.21.x. Affected by this issue is the function cast_input of the component Module Handler. 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:

Ash Framework is a declarative, extensible framework for building Elixir applications. Prior to version 3.22.0, Ash.Type.Module.cast_input/2 unconditionally creates a new Erlang atom via Module.concat([value]) for any user-supplied binary string that starts with "Elixir.", before verifying whether the referenced module exists. Because Erlang atoms are never garbage-collected and the BEAM atom table has a hard default limit of approximately 1,048,576 entries, an attacker who can submit values to any resource attribute or argument of type :module can exhaust this table and crash the entire BEAM VM, taking down the application. This issue has been patched in version 3.22.0.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-34593 since 03/30/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 3.22.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Type

• Project Management Software

Vendor

• ash-project

Name

• ash

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21

Website

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

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