CVE-2026-34593Public exploitNetwork attack vector

BEAM VM crash via unchecked atom creation

Published Apr 2, 2026 · Updated Apr 2, 2026

Resource exhaustion in Ash before 3.22.0 allows remote attackers to crash the BEAM VM through a module-typed API input. Ash.Type.Module.cast_input/2 passes each attacker-controlled Elixir-prefixed string to Module.concat before checking module existence, permanently allocating a new atom. Reachability requires an application to expose a :module-typed resource attribute or argument; filling the finite atom table terminates the entire VM process and interrupts every resource it serves.

CVSS severity8.2
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Ash before 3.22.0 allows remote attackers to crash the BEAM VM through a module-typed API input. Ash.Type.Module.cast_input/2 passes each attacker-controlled Elixir-prefixed string to Module.concat before checking module existence, permanently allocating a new atom. Reachability requires an application to expose a :module-typed resource attribute or argument; filling the finite atom table terminates the entire VM process and interrupts every resource it serves.

The record

CVE
CVE-2026-34593
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Ash Framework
Product
Ash
Classifications
CWE-770, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ash Framework · Ashversion=< 3.22.0

Published CVSS scores

8.2GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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