CVE-2026-8469

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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.</p><p>This issue affects phoenix_storybook from 0.2.0 before 1.1.0.</p>"}], "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: '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.\n\nThis issue affects phoenix_storybook from 0.2.0 before 1.1.0."}], "impacts": [{"capecId": "CAPEC-130", "descriptions": [{"lang": "en", "value": "CAPEC-130 Excessive Allocation"}]}], "metrics": [{"cvssV4_0": {"attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 8.2, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-05-27T15:40:55.927Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-8469.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-8469"}, {"tags": ["patch"], "url": "https://github.com/phenixdigital/phoenix_storybook/commit/96d524690af0fe197a49f60d18e564a620b9ef81"}], "source": {"discovery": "EXTERNAL"}, "title": "Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook", "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"references": [{"url": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-21T13:55:42.783019Z", "id": "CVE-2026-8469", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-21T13:56:33.631Z"}}]}}

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'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.\n\nThis issue affects phoenix_storybook from 0.2.0 before 1.1.0.", "supportingMedia": [{"type": "text/html", "value": "<p>Allocation of Resources Without Limits or Throttling vulnerability in phenixdigital phoenix_storybook allows unauthenticated denial-of-service via BEAM atom table exhaustion.</p><p>Multiple LiveView event handlers convert user-supplied event parameter strings to atoms using <tt>String.to_atom/1</tt> without validation: <tt>'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_set_variation_assign/3</tt> interns every key of the <tt>psb-assign</tt> params map; <tt>'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_toggle_variation_assign/3</tt> interns the <tt>\"attr\"</tt> value from <tt>psb-toggle</tt> events; <tt>'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_variation_id/2</tt> interns elements of <tt>\"variation_id\"</tt>; and <tt>'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_value/4</tt> interns raw string values for attributes declared as <tt>:atom</tt> or <tt>:boolean</tt>. 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.</p><p>This issue affects phoenix_storybook from 0.2.0 before 1.1.0.</p>", "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": "2026-05-27T15:40:55.927Z"}}}, "cveMetadata": {"cveId": "CVE-2026-8469", "state": "PUBLISHED", "dateUpdated": "2026-05-27T15:40:55.927Z", "dateReserved": "2026-05-13T11:44:43.316Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-05-20T13:35:27.914Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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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: 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_set_variation_assign/3 interna cada clave del mapa de par\u00e1metros psb-assign; 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_toggle_variation_assign/3 interna el valor 'attr' de los eventos psb-toggle; 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_variation_id/2 interna elementos de 'variation_id'; y 'Elixir.PhoenixStorybook.ExtraAssignsHelpers':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"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.2.0,1.1.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "phoenix_storybook", "source": "cna", "vendor": "phenixdigital"}, "product": "phoenix_storybook", "vendor": "phenixdigital"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0228669d55c23a754d1ef11f49a32121129d5395,96d524690af0fe197a49f60d18e564a620b9ef81)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "phoenix_storybook", "source": "cna", "vendor": "phenixdigital"}, "product": "phoenix_storybook", "vendor": "phenixdigital"}], "created": "2026-05-20T15:30:33.489887+00:00", "updated": "2026-05-21T08:19:17.142055+00:00", "vendors": ["phenixdigital", "phenixdigital$PRODUCT$phoenix_storybook"]}