{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.11.0"
              },
              {
                "fixed": "0.18.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "a42177bfc4acd27bb2f25372da9b3de467d6bcae"
            },
            {
              "fixed": "808e4b17ee821a8dac98bda5bf01da0fe1b69d41"
            },
            {
              "fixed": "0ab5c83a7df28d51a6de1fb9b859a142b2b12919"
            }
          ],
          "repo": "https://github.com/ash-project/ash_typescript",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rj47-h936-4cxw"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77856.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "7c3d30896f2f9a54edea17e3787549776b1b288d"
          },
          {
            "fixed": "0ab5c83a7df28d51a6de1fb9b859a142b2b12919"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Allocation of Resources Without Limits or Throttling vulnerability in ash-project ash_typescript allows an unauthenticated attacker to exhaust the BEAM atom table and abort the node via client-supplied typed struct field names.\n\nresolve_typed_struct_field/2 in lib/ash_typescript/rpc/field_processing/field_selector.ex looks a client-supplied field name up in the typed struct's reverse map and, when it finds no match, falls back to String.to_atom/1. Because this runs before any field-existence check, an unresolvable name mints a permanent atom rather than being rejected as unknown. Atoms are never garbage collected, so a request carrying many distinct names on a typed struct field grows the atom table until the VM aborts at its limit.\n\nThis issue affects ash_typescript: from 0.11.0 before 0.18.0.",
  "id": "CVE-2026-77856",
  "modified": "2026-09-02T03:30:37.347341448Z",
  "published": "2026-09-01T02:08:46.189Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-77856.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-77856"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77856.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-rj47-h936-4cxw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77856"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ash-project/ash_typescript/commit/0ab5c83a7df28d51a6de1fb9b859a142b2b12919"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ash-project/ash_typescript"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Unbounded atom creation from typed struct field names in AshTypescript field selector"
}