FKIE_CVE-2026-8469
Vulnerability from fkie_nvd - Published: 2026-05-20 14:17 - Updated: 2026-07-23 12:10
Severity
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"Elixir.PhoenixStorybook.ExtraAssignsHelpers",
"Elixir.PhoenixStorybook.Story.Playground"
],
"packageName": "phoenix_storybook",
"packageURL": "pkg:hex/phoenix_storybook",
"product": "phoenix_storybook",
"programFiles": [
"lib/phoenix_storybook/helpers/extra_assigns_helpers.ex",
"lib/phx_live_storybook/live/entry_live.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_set_variation_assign/3"
},
{
"name": "\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_toggle_variation_assign/3"
},
{
"name": "\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_variation_id/2"
},
{
"name": "\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_value/4"
}
],
"repo": "https://github.com/phenixdigital/phoenix_storybook",
"vendor": "phenixdigital",
"versions": [
{
"lessThan": "1.1.0",
"status": "affected",
"version": "0.2.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"Elixir.PhoenixStorybook.ExtraAssignsHelpers",
"Elixir.PhoenixStorybook.Story.Playground"
],
"packageName": "phenixdigital/phoenix_storybook",
"packageURL": "pkg:github/phenixdigital/phoenix_storybook",
"product": "phoenix_storybook",
"programFiles": [
"lib/phoenix_storybook/helpers/extra_assigns_helpers.ex",
"lib/phx_live_storybook/live/entry_live.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_set_variation_assign/3"
},
{
"name": "\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_toggle_variation_assign/3"
},
{
"name": "\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_variation_id/2"
},
{
"name": "\u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_value/4"
}
],
"repo": "https://github.com/phenixdigital/phoenix_storybook",
"vendor": "phenixdigital",
"versions": [
{
"lessThan": "96d524690af0fe197a49f60d18e564a620b9ef81",
"status": "affected",
"version": "0228669d55c23a754d1ef11f49a32121129d5395",
"versionType": "git"
}
]
}
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Allocation of Resources Without Limits 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."
},
{
"lang": "es",
"value": "Vulnerabilidad de asignaci\u00f3n de recursos sin l\u00edmites ni limitaci\u00f3n en phenixdigital phoenix_storybook permite una denegaci\u00f3n de servicio no autenticada mediante el agotamiento de la tabla de \u00e1tomos de BEAM.\n\nM\u00faltiples manejadores de eventos de LiveView convierten cadenas de par\u00e1metros de eventos suministradas por el usuario en \u00e1tomos utilizando String.to_atom/1 sin validaci\u00f3n: \u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_set_variation_assign/3 interna cada clave del mapa de par\u00e1metros psb-assign; \u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:handle_toggle_variation_assign/3 interna el valor \u0027attr\u0027 de los eventos psb-toggle; \u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_variation_id/2 interna elementos de \u0027variation_id\u0027; y \u0027Elixir.PhoenixStorybook.ExtraAssignsHelpers\u0027:to_value/4 interna valores de cadena sin procesar para atributos declarados como :atom o :boolean. Los \u00e1tomos de BEAM nunca se recolectan por el recolector de basura, por lo que cada cadena \u00fanica controlada por el atacante es una asignaci\u00f3n permanente. Una vez que se alcanza el l\u00edmite de la tabla de \u00e1tomos (~1.048.576 \u00e1tomos), el nodo BEAM completo aborta, derribando todas las aplicaciones que se ejecutan en \u00e9l.\n\nEste problema afecta a phoenix_storybook desde 0.2.0 antes de 1.1.0."
}
],
"id": "CVE-2026-8469",
"lastModified": "2026-07-23T12:10:00.110",
"metrics": {
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-8469",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-21T13:55:42.783019Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-05-20T14:17:04.447",
"references": [
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://cna.erlef.org/cves/CVE-2026-8469.html"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/phenixdigital/phoenix_storybook/commit/96d524690af0fe197a49f60d18e564a620b9ef81"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-8469"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q"
}
],
"sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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