What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-02 · updated 2026-07-24
• Weakness: CWE-400

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.

Affected products

• ash-project ash: before 3.22.0 — fixed in 3.22.0

How to fix

Upgrade to a fixed version: ash-project ash 3.22.0. Check the vendor advisory for mitigations.

References

• https://github.com/ash-project/ash/releases/tag/v3.22.0
• https://github.com/ash-project/ash/security/advisories/GHSA-jjf9-w5vj-r6vp
• https://github.com/ash-project/ash/security/advisories/GHSA-jjf9-w5vj-r6vp

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