Resource exhaustion in Ash-Hq Ash Framework
CVE-2026-34593
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (38.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.004 · change: -0.001
Affected products
- Ash-Hq Ash Framework
- Ash-Project Ash — versions < 3.22.0
Weakness classification (CWE)
References
- github.com/ash-project/ash/security/advisories/GHSA-jjf9-w5vj-r6vp (Exploit, Vendor Advisory)
- github.com/ash-project/ash/releases/tag/v3.22.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34593?
- CVE-2026-34593 is a high-severity vulnerability in Ash-Hq Ash Framework, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-04-02.
- How severe is CVE-2026-34593?
- High severity. CVSS v3 base score is 7.5 out of 10.