{"id":"CVE-2026-8469","state":"PUBLISHED","title":"Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook","description":"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.","publishedAt":"2026-05-20T13:35:27.914Z","updatedAt":"2026-05-27T15:40:55.927Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"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","source":"EEF"},"assigner":"EEF","products":["phenixdigital phoenix_storybook"],"affected":[{"vendor":"phenixdigital","product":"phoenix_storybook","packageName":"phoenix_storybook","packageURL":"pkg:hex/phoenix_storybook","defaultStatus":"unaffected","versions":[{"version":"0.2.0","status":"affected","lessThan":"1.1.0","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*"],"modules":["Elixir.PhoenixStorybook.ExtraAssignsHelpers","Elixir.PhoenixStorybook.Story.Playground"],"programFiles":["lib/phoenix_storybook/helpers/extra_assigns_helpers.ex","lib/phx_live_storybook/live/entry_live.ex"],"programRoutines":[{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_set_variation_assign/3"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_toggle_variation_assign/3"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_variation_id/2"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_value/4"}],"repo":"https://github.com/phenixdigital/phoenix_storybook"},{"vendor":"phenixdigital","product":"phoenix_storybook","packageName":"phenixdigital/phoenix_storybook","packageURL":"pkg:github/phenixdigital/phoenix_storybook","defaultStatus":"unaffected","versions":[{"version":"0228669d55c23a754d1ef11f49a32121129d5395","status":"affected","lessThan":"96d524690af0fe197a49f60d18e564a620b9ef81","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*"],"modules":["Elixir.PhoenixStorybook.ExtraAssignsHelpers","Elixir.PhoenixStorybook.Story.Playground"],"programFiles":["lib/phoenix_storybook/helpers/extra_assigns_helpers.ex","lib/phx_live_storybook/live/entry_live.ex"],"programRoutines":[{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_set_variation_assign/3"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_toggle_variation_assign/3"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_variation_id/2"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_value/4"}],"repo":"https://github.com/phenixdigital/phoenix_storybook"}],"references":["https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q","https://cna.erlef.org/cves/CVE-2026-8469.html","https://osv.dev/vulnerability/EEF-CVE-2026-8469","https://github.com/phenixdigital/phoenix_storybook/commit/96d524690af0fe197a49f60d18e564a620b9ef81"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/8xxx/CVE-2026-8469.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8469","state":"PUBLISHED","datePublished":"2026-05-20T13:35:27.914Z","dateUpdated":"2026-05-27T15:40:55.927Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-05-13T11:44:43.316Z"},"containers":{"cna":{"title":"Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook","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: '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."}],"affected":[{"vendor":"phenixdigital","product":"phoenix_storybook","packageName":"phoenix_storybook","packageURL":"pkg:hex/phoenix_storybook","defaultStatus":"unaffected","versions":[{"version":"0.2.0","status":"affected","lessThan":"1.1.0","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*"],"modules":["Elixir.PhoenixStorybook.ExtraAssignsHelpers","Elixir.PhoenixStorybook.Story.Playground"],"programFiles":["lib/phoenix_storybook/helpers/extra_assigns_helpers.ex","lib/phx_live_storybook/live/entry_live.ex"],"programRoutines":[{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_set_variation_assign/3"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_toggle_variation_assign/3"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_variation_id/2"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_value/4"}],"repo":"https://github.com/phenixdigital/phoenix_storybook"},{"vendor":"phenixdigital","product":"phoenix_storybook","packageName":"phenixdigital/phoenix_storybook","packageURL":"pkg:github/phenixdigital/phoenix_storybook","defaultStatus":"unaffected","versions":[{"version":"0228669d55c23a754d1ef11f49a32121129d5395","status":"affected","lessThan":"96d524690af0fe197a49f60d18e564a620b9ef81","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*"],"modules":["Elixir.PhoenixStorybook.ExtraAssignsHelpers","Elixir.PhoenixStorybook.Story.Playground"],"programFiles":["lib/phoenix_storybook/helpers/extra_assigns_helpers.ex","lib/phx_live_storybook/live/entry_live.ex"],"programRoutines":[{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_set_variation_assign/3"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':handle_toggle_variation_assign/3"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_variation_id/2"},{"name":"'Elixir.PhoenixStorybook.ExtraAssignsHelpers':to_value/4"}],"repo":"https://github.com/phenixdigital/phoenix_storybook"}],"references":[{"url":"https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q","tags":["vendor-advisory","related"]},{"url":"https://cna.erlef.org/cves/CVE-2026-8469.html","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-8469","tags":["related"]},{"url":"https://github.com/phenixdigital/phoenix_storybook/commit/96d524690af0fe197a49f60d18e564a620b9ef81","tags":["patch"]}],"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":{"shortName":"EEF","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateUpdated":"2026-05-27T15:40:55.927Z"},"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:*:*:*:*:*:*:*:*","versionEndExcluding":"1.1.0","versionStartIncluding":"0.2.0","vulnerable":true}],"operator":"OR"}]}],"credits":[{"lang":"en","type":"finder","value":"Peter Ullrich"},{"lang":"en","type":"remediation developer","value":"Christian Blavier"},{"lang":"en","type":"analyst","value":"Jonatan Männchen / EEF"}],"impacts":[{"capecId":"CAPEC-130","descriptions":[{"lang":"en","value":"CAPEC-130 Excessive Allocation"}]}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-21T13:56:33.631Z"}}]}}}