{"id":"CVE-2026-63759","aliases":["EUVD-2026-45930","GHSA-56pq-53x9-mxc4","GHSA-q8qp-67f9-wr3f"],"status":"published","title":"SurrealDB before 3.1.0 Denial of Service nested type annotations","description":"SurrealDB before 3.1.0 fails to enforce recursion depth limits in the type/kind parser when processing nested type annotations. Authenticated attackers can send queries with deeply nested type annotations to exhaust server memory and crash the process.","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0045,"percentile":0.39402,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-674"],"published":"2026-07-01T20:05:14Z","modified":"2026-11-04T02:47:49Z","fixes":[{"ecosystem":"crates.io","package":"surrealdb","fixed_in":["3.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"crates.io","package":"surrealdb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0"}]}]},{"source":"osv","ecosystem":"crates.io","package":"surrealdb","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.0"}]}]}],"products":[{"vendor":"surrealdb","product":"surrealdb"}],"references":[{"url":"https://github.com/surrealdb/surrealdb/security/advisories/GHSA-q8qp-67f9-wr3f","tags":["vendor-advisory","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://www.vulncheck.com/advisories/surrealdb-before-denial-of-service-nested-type-annotations","tags":["third-party-advisory","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63759","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-56pq-53x9-mxc4"},{"url":"https://github.com/surrealdb/surrealdb/commit/61d509b766afdf67cc26d8203fd7dc583c8d77aa","tags":["web"]},{"url":"https://github.com/advisories/GHSA-q8qp-67f9-wr3f"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63759.json","tags":["advisory"]},{"url":"https://github.com/surrealdb/surrealdb","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-63759","title":"SurrealDB before 3.1.0 Denial of Service nested type annotations","description":"SurrealDB before 3.1.0 fails to enforce recursion depth limits in the type/kind parser when processing nested type annotations. Authenticated attackers can send queries with deeply nested type annotations to exhaust server memory and crash the process.","status":"published","published":"2026-07-20T12:04:49.105Z","modified":"2026-07-28T01:05:50.034Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:19:55.914391Z"}],"euvd":[{"id":"EUVD-2026-45930","description":"SurrealDB before 3.1.0 fails to enforce recursion depth limits in the type/kind parser when processing nested type annotations. Authenticated attackers can send queries with deeply nested type annotations to exhaust server memory and crash the process.","status":"published","published":"2026-07-20T12:04:49Z","modified":"2026-07-28T01:05:50Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:02:33.420584Z"}],"ghsa":[{"id":"GHSA-56pq-53x9-mxc4","title":"SurrealDB before 3.1.0 fails to enforce recursion depth limits in the type/kind parser when...","description":"SurrealDB before 3.1.0 fails to enforce recursion depth limits in the type/kind parser when processing nested type annotations. Authenticated attackers can send queries with deeply nested type annotations to exhaust server memory and crash the process.","status":"published","published":"2026-07-20T12:33:11Z","modified":"2026-07-20T12:33:17Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T15:09:36.398204Z"},{"id":"GHSA-q8qp-67f9-wr3f","title":"SurrealDB vulnerable to Denial of Service due to nested types annotations","description":"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\u003coption\u003carray\u003coption\u003c...\u003e\u003e\u003e\u003e`) 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\u003c...\u003e` 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.","status":"published","published":"2026-07-01T20:05:14Z","modified":"2026-07-01T20:05:15Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:40:36.577366Z"}],"nvd":[{"id":"CVE-2026-63759","description":"SurrealDB before 3.1.0 fails to enforce recursion depth limits in the type/kind parser when processing nested type annotations. Authenticated attackers can send queries with deeply nested type annotations to exhaust server memory and crash the process.","status":"published","published":"2026-07-20T12:19:46.047Z","modified":"2026-07-23T20:17:21.027Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:12:31.024898Z"}],"osv":[{"id":"CVE-2026-63759","title":"SurrealDB before 3.1.0 Denial of Service nested type annotations","description":"SurrealDB before 3.1.0 fails to enforce recursion depth limits in the type/kind parser when processing nested type annotations. Authenticated attackers can send queries with deeply nested type annotations to exhaust server memory and crash the process.","status":"published","published":"2026-07-20T12:04:49.105Z","modified":"2026-11-04T02:47:49.830683439Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-674"],"updated_at":"2026-11-04T02:53:00.786919Z"},{"id":"GHSA-q8qp-67f9-wr3f","title":"SurrealDB vulnerable to Denial of Service due to nested types annotations","description":"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\u003coption\u003carray\u003coption\u003c...\u003e\u003e\u003e\u003e`) 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\u003c...\u003e` 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.","status":"published","published":"2026-07-01T20:05:14Z","modified":"2026-11-04T02:56:08.372827705Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-674"],"updated_at":"2026-11-04T03:25:28.514393Z"}]}}