Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook_CVE-2026-8469

{
    "lastseen": "",
    "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.",
    "published": "2026-05-20T13:35:27.914Z",
    "modified": "2026-05-20T13:35:27.914Z",
    "type": "cve",
    "title": "Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook",
    "source": "EEF",
    "references": "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q\nhttps://cna.erlef.org/cves/CVE-2026-8469.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-8469\nhttps://github.com/phenixdigital/phoenix_storybook/commit/96d524690af0fe197a49f60d18e564a620b9ef81",
    "id": "CVE-2026-8469",
    "bulletinFamily": "",
    "cwe": [
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "phenixdigital phoenix_storybook 0.2.0\nphenixdigital phoenix_storybook 0228669d55c23a754d1ef11f49a32121129d5395",
    "sourceHref": "",
    "cvss": {
        "score": 8.2,
        "severity": "HIGH",
        "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "phoenix_storybook",
    "version": "0.2.0",
    "vendor": "phenixdigital",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}