{"id":"CVE-2026-8469","aliases":["EEF-CVE-2026-8469","GHSA-833p-95jq-929q"],"url":"https://o3.security/vulnerability/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.","published":"2026-05-20T13:35:27.914Z","modified":"2026-08-12T03:51:22.015773336Z","cvss":null,"epss":{"score":0.00537,"percentile":0.4282,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Hex","name":"phoenix_storybook","fixedVersion":"1.1.0"}],"fix":{"url":"https://github.com/phenixdigital/phoenix_storybook/commit/96d524690af0fe197a49f60d18e564a620b9ef81","label":"phenixdigital/phoenix_storybook@96d5246"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:22.015773336Z"}}