{
  "affected": [
    {
      "database_specific": {
        "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-q8qp-67f9-wr3f/GHSA-q8qp-67f9-wr3f.json"
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "surrealdb",
        "purl": "pkg:cargo/surrealdb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.0"
            }
          ],
          "type": "SEMVER"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-63759"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-674"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-01T20:05:14Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "The SurrealDB type/kind parser did not enforce the configured recursion depth limit when parsing nested type annotations. The expression parser already enforced the limit for analogous constructs; the kind parser omitted it. An authenticated attacker could send a query with deeply nested type annotations (e.g., `array<option<array<option<...>>>>`) and exhaust server memory, crashing the process.\n\nThis is an incomplete fix for [GHSA-6r8p-hpg7-825g](https://github.com/surrealdb/surrealdb/security/advisories/GHSA-6r8p-hpg7-825g), which addressed the same class of bug in the expression parser but did not cover the kind/type annotation parser code path.\n\n### Impact\n\nAn authenticated user with query execution privileges can crash a SurrealDB server with a single WebSocket message containing deeply nested type annotations.\n\n### Patches\n\nA patch has been introduced that wraps `parse_concrete_kind` and the `OPTION<...>` arm of `parse_inner_kind` with `enter_object_recursion!`, bounding the recursive cycle `parse_concrete_kind → parse_inner_kind → parse_inner_single_kind → parse_concrete_kind` at the configured `object_recursion_limit` (default 100). Regression tests cover both cast and `DEFINE FIELD` paths.\n\n- Versions 3.1.0 and later are not affected by this issue.\n\n### Workarounds\n\nRestrict the ability of untrusted users to execute arbitrary queries via the `--deny-arbitrary-query` capability flag for the affected user classes (guest, record, or system). Disabling untrusted access to the WebSocket `/rpc` endpoint also prevents exploitation; the HTTP `/sql` endpoint's 1 MiB body limit constrains nesting to a depth where OOM is not feasible.",
  "id": "GHSA-q8qp-67f9-wr3f",
  "modified": "2026-11-04T02:56:08.372827705Z",
  "published": "2026-07-01T20:05:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/surrealdb/surrealdb/security/advisories/GHSA-q8qp-67f9-wr3f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/surrealdb/surrealdb/commit/61d509b766afdf67cc26d8203fd7dc583c8d77aa"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/surrealdb/surrealdb"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SurrealDB vulnerable to Denial of Service due to nested types annotations"
}