Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook

{
  "id": "13a918239310690f9f3d01543363b2640fc4c178b4fefbcbc01a165f36804003",
  "url": "https://osv.dev/vulnerability/CVE-2026-8469",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Unauthenticated denial-of-service via BEAM atom table exhaustion in phoenix_storybook",
    "summary": "Allocation of Resources Without Limits or Throttling vulnerability in phenixdigital phoenix_storybook allows unauthenticated denial-of-service via BEAM atom table exhaustion. Multiple 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. This issue affects phoenix_storybook from 0.2.0 before 1.1.0.",
    "evidence": "osv:CVE-2026-8469",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-8469",
      "aliases": [
        "CVE-2026-8469",
        "EEF-CVE-2026-8469",
        "GHSA-833p-95jq-929q"
      ],
      "metrics": [
        {
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/phenixdigital/phoenix_storybook",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0228669d55c23a754d1ef11f49a32121129d5395"
                },
                {
                  "fixed": "96d524690af0fe197a49f60d18e564a620b9ef81"
                },
                {
                  "introduced": "bbbf72db13cc5c866073d58fc65009700b775f4f"
                },
                {
                  "fixed": "685e23efc81afd9bc921d4afa984fff34c4b7e55"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0228669d55c23a754d1ef11f49a32121129d5395"
                      },
                      {
                        "fixed": "96d524690af0fe197a49f60d18e564a620b9ef81"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0.2.0"
                      },
                      {
                        "fixed": "1.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "96d524690af0fe197a49f60d18e564a620b9ef81"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "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"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.090671717Z",
      "provider": "osv",
      "references": [
        "https://cna.erlef.org/cves/CVE-2026-8469.html",
        "https://github.com",
        "https://osv.dev/vulnerability/EEF-CVE-2026-8469",
        "https://repo.hex.pm",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8469.json",
        "https://github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-833p-95jq-929q",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-8469",
        "https://github.com/phenixdigital/phoenix_storybook/commit/96d524690af0fe197a49f60d18e564a620b9ef81",
        "https://github.com/phenixdigital/phoenix_storybook"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "EEF",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8469.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-8469",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 506701,
  "published_at": "2026-05-20T13:35:27.914+00:00"
}