Vulnerability · Published Apr 2, 2026 · Assigned by GitHub_M

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

High 8.2

In plain English

A high-severity uncontrolled resource consumption in ash from ash-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.4%top 61.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
ash-project	ash	< 3.22.0

Weakness: CWE-400 · Vector: 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

References

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