{"id":"GHSA-q8qp-67f9-wr3f","title":"SurrealDB vulnerable to Denial of Service due to nested types annotations","summary":"SurrealDB vulnerable to Denial of Service due to nested types annotations","severity":"medium","cvss":6.5,"cwe":["CWE-674"],"vendor":"surrealdb","product":"surrealdb","ecosystem":"rust","affected":["surrealdb < 3.1.0"],"patched":["surrealdb 3.1.0"],"published":"2026-07-01","updated":"2026-07-01","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-q8qp-67f9-wr3f","references":[{"url":"https://github.com/surrealdb/surrealdb/security/advisories/GHSA-q8qp-67f9-wr3f"},{"url":"https://github.com/surrealdb/surrealdb/commit/61d509b766afdf67cc26d8203fd7dc583c8d77aa"},{"url":"https://github.com/advisories/GHSA-q8qp-67f9-wr3f"}],"tags":["ghsa","rust"],"ingestedAt":"2026-07-01T20:16:35.275Z","slug":"GHSA-q8qp-67f9-wr3f","body":"## Overview\n\nThe 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.\n\n## Affected packages\n\n- `surrealdb < 3.1.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `surrealdb 3.1.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}