{"id":"CVE-2026-8469","summary":"Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook","details":"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.","aliases":["EEF-CVE-2026-8469","GHSA-833p-95jq-929q"],"modified":"2026-08-04T11:51:20.733278687Z","published":"2026-05-20T13:35:27.914Z","database_specific":{"cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8469.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0228669d55c23a754d1ef11f49a32121129d5395"},{"fixed":"96d524690af0fe197a49f60d18e564a620b9ef81"}]}],"cna_assigner":"EEF"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-8469.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-8469"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8469.json"},{"type":"ADVISORY","url":"https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8469"},{"type":"FIX","url":"https://github.com/phenixdigital/phoenix_storybook/commit/96d524690af0fe197a49f60d18e564a620b9ef81"},{"type":"PACKAGE","url":"https://github.com/phenixdigital/phoenix_storybook"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/phenixdigital/phoenix_storybook","events":[{"introduced":"bbbf72db13cc5c866073d58fc65009700b775f4f"},{"fixed":"685e23efc81afd9bc921d4afa984fff34c4b7e55"}],"database_specific":{"extracted_events":[{"introduced":"0.2.0"},{"fixed":"1.1.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.0.0","v0.9.3","v0.9.2","v0.9.1","v0.9.0","v0.8.3","v0.8.1","v0.7.2","v0.7.1","v0.7.0","v0.6.4","v0.6.3","v0.6.2","v0.6.1","v0.6.0","v0.5.7","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.5","v0.4.4","v0.4.3","v0.4.2","v0.4.1","v0.4.0","v0.3.0","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8469.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"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"}]}