CVE-2026-34593: Ash-hq Ash Framework denial of service (CVSS 7.5)

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Ash-hq Ash Framework< 3.22.0

Remediation

Fixed in

Ash-hq Ash Framework≥ 3.22.0

Patch & vendor advisories

https://github.com/ash-project/ash/security/advisories/GHSA-jjf9-w5vj-r6vp

References

https://github.com/ash-project/ash/releases/tag/v3.22.0ProductRelease Notes
https://github.com/ash-project/ash/security/advisories/GHSA-jjf9-w5vj-r6vpExploitVendor Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-34593 being actively exploited?

CVE-2026-34593 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.52%.

How severe is CVE-2026-34593?

CVE-2026-34593 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.52% probability of exploitation.

Which products are affected by CVE-2026-34593?

Affected products include Ash-hq Ash Framework.

How do I fix CVE-2026-34593?

Upgrade affected software to a fixed version, for example Ash-hq Ash Framework 3.22.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34593 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo