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CVE-2026-34593— Ash Framework: Ash.Type.Module.cast_input/2 atom exhaustion via unchecked Module.concat allows BEAM VM crash

Quick assessment

Affected
ash-project ash
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ash Framework是Ash Framework开源的一个用于构建Elixir应用程序的框架。 Ash Framework 3.22.0之前版本存在资源管理错误漏洞，该漏洞源于Ash.Type.Module.cast_input/2无条件地为任何以 Elixir. 开头的用户提供二进制字符串创建新的Erlang原子，可能导致耗尽原子表并使整个BEAM虚拟机崩溃。

AI Predicted 7.5 Difficulty: Easy EPSS 0.52% · P42
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I. Basic Information for CVE-2026-34593

Vulnerability Information
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Vulnerability Title
Ash Framework: Ash.Type.Module.cast_input/2 atom exhaustion via unchecked Module.concat allows BEAM VM crash
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Ash Framework 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ash Framework是Ash Framework开源的一个用于构建Elixir应用程序的框架。 Ash Framework 3.22.0之前版本存在资源管理错误漏洞，该漏洞源于Ash.Type.Module.cast_input/2无条件地为任何以 Elixir. 开头的用户提供二进制字符串创建新的Erlang原子，可能导致耗尽原子表并使整个BEAM虚拟机崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash < 3.22.0 -

II. Public POCs for CVE-2026-34593

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III. Intelligence Information for CVE-2026-34593

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Vendor Advisories for CVE-2026-34593 (1)

IV. Related Vulnerabilities

Same product: ash
Same vendor: ash-project
Same weakness: CWE-400

V. Comments for CVE-2026-34593

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