CVE-2026-8469 (GCVE-0-2026-8469)
Vulnerability from cvelistv5 – Published: 2026-05-20 13:35 – Updated: 2026-05-22 04:38
VLAI
Title
Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook
Summary
Allocation of Resources Without Limits or Throttling vulnerability in phenixdigital phoenix_storybook allows unauthenticated denial-of-service via BEAM atom table exhaustion.
Multiple LiveView event handlers convert user-supplied event parameter strings to atoms using String.to_atom/1 without validation: 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_set_variation_assign/3 interns every key of the psb-assign params map; 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_toggle_variation_assign/3 interns the "attr" value from psb-toggle events; 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_variation_id/2 interns elements of "variation_id"; and 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_value/4 interns raw string values for attributes declared as :atom or :boolean. BEAM atoms are never garbage-collected, so each unique attacker-controlled string is a permanent allocation. Once the atom table ceiling (~1,048,576 atoms) is reached, the entire BEAM node aborts, taking down all applications running on it.
This issue affects phoenix_storybook from 0.2.0 before 1.1.0.
Severity
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/phenixdigital/phoenix_storyboo… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-8469.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-8469 | related |
| https://github.com/phenixdigital/phoenix_storyboo… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| phenixdigital | phoenix_storybook |
Affected:
0.2.0 , < 1.1.0
(semver)
cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:* |
|
| phenixdigital | phoenix_storybook |
Affected:
0228669d55c23a754d1ef11f49a32121129d5395 , < 96d524690af0fe197a49f60d18e564a620b9ef81
(git)
cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:* |
Credits
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or Throttling vulnerability in phenixdigital phoenix_storybook allows unauthenticated denial-of-service via BEAM atom table exhaustion.\\n\\nMultiple LiveView event handlers convert user-supplied event parameter strings to atoms using String.to_atom/1 without validation: \u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_set_variation_assign/3 interns every key of the psb-assign params map; \u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_toggle_variation_assign/3 interns the \\\"attr\\\" value from psb-toggle events; \u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_variation_id/2 interns elements of \\\"variation_id\\\"; and \u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_value/4 interns raw string values for attributes declared as :atom or :boolean. BEAM atoms are never garbage-collected, so each unique attacker-controlled string is a permanent allocation. Once the atom table ceiling (~1,048,576 atoms) is reached, the entire BEAM node aborts, taking down all applications running on it.\\n\\nThis issue affects phoenix_storybook from 0.2.0 before 1.1.0.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eAllocation of Resources Without Limits or Throttling vulnerability in phenixdigital phoenix_storybook allows unauthenticated denial-of-service via BEAM atom table exhaustion.\u003c/p\u003e\u003cp\u003eMultiple LiveView event handlers convert user-supplied event parameter strings to atoms using \u003ctt\u003eString.to_atom/1\u003c/tt\u003e without validation: \u003ctt\u003e\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_set_variation_assign/3\u003c/tt\u003e interns every key of the \u003ctt\u003epsb-assign\u003c/tt\u003e params map; \u003ctt\u003e\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_toggle_variation_assign/3\u003c/tt\u003e interns the \u003ctt\u003e\\\"attr\\\"\u003c/tt\u003e value from \u003ctt\u003epsb-toggle\u003c/tt\u003e events; \u003ctt\u003e\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_variation_id/2\u003c/tt\u003e interns elements of \u003ctt\u003e\\\"variation_id\\\"\u003c/tt\u003e; and \u003ctt\u003e\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_value/4\u003c/tt\u003e interns raw string values for attributes declared as \u003ctt\u003e:atom\u003c/tt\u003e or \u003ctt\u003e:boolean\u003c/tt\u003e. BEAM atoms are never garbage-collected, so each unique attacker-controlled string is a permanent allocation. Once the atom table ceiling (~1,048,576 atoms) is reached, the entire BEAM node aborts, taking down all applications running on it.\u003c/p\u003e\u003cp\u003eThis issue affects phoenix_storybook from 0.2.0 before 1.1.0.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770 Allocation of Resources Without Limits or Throttling\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"Phoenix Storybook must be mounted on a network-reachable route.\"}], \"cpeApplicability\": [{\"nodes\": [{\"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.1.0\", \"versionStartIncluding\": \"0.2.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-05-22T04:38:05.472Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-8469\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-22T04:38:05.472Z\", \"dateReserved\": \"2026-05-13T11:44:43.316Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-05-20T13:35:27.914Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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