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TI-2026-26840 Aliases CVE-2026-34593GHSA-jjf9-w5vj-r6vp

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

Priority HIGH 75CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00439 38th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed ash (ash-project): 3.22.0ash (Hex): 3.22.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ash-projectashbefore 3.22.03.22.0Patch availableCNA
—ash (Hex)before 3.22.03.22.0Patch availableGHSA-jjf9-w5vj-r6vp
  • ash Vendorash-project Affected before 3.22.0 Fixed in 3.22.0 Patch available CNA
  • ash (Hex) Vendor— Affected before 3.22.0 Fixed in 3.22.0 Patch available GHSA-jjf9-w5vj-r6vp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ash-hq:ash_framework:*:*:*:*:*:*:*:*before 3.22.0Vulnerableash-project
  • cpe:2.3:a:ash-hq:ash_framework:*:*:*:*:*:*:*:* Versions before 3.22.0 Vulnerable ·ash-project

Remediation

  • Fix · CNA ash (ash-project) Fixed in 3.22.0
  • Fix · GHSA-jjf9-w5vj-r6vp ash (Hex) Fixed in 3.22.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34593
  2. 2026-10-03 Alias added: GHSA-jjf9-w5vj-r6vp

References

Exploit 1

Advisory 1

Other 3

  • TI-2026-47745 Filter expression injection via forged keyset pagination cursor in Ash CVSS 4.0HIGH 7.5
  • TI-2026-48952 Memory exhaustion via unbounded deserialization of keyset pagination cursors in Ash.Page.Keyset CVSS 4.0MEDIUM 5.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences