{"id":"CVE-2026-63760","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-63760","summary":"SurrealDB has Denial of Service in JSON parser due to nested objects","details":"The SurrealDB value and JSON parser did not enforce the configured recursion depth limit when parsing nested `{`, `[`, or `(` tokens. The expression parser already enforced the limit for these tokens; the value/JSON parser omitted it. An unauthenticated attacker could send a deeply nested JSON payload to the WebSocket `/rpc` endpoint 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 value/JSON parser code path.\n\n### Impact\n\nAn unauthenticated remote attacker can crash a SurrealDB server with a single WebSocket message. No credentials or query execution privileges are required.\n\n### Patches\n\nA patch enforces the configured recursion depth limit in `parse_value` and `parse_json`, bringing them in line with the rest of the parser.\n\n- Versions 3.1.0 and later are not affected by this issue.\n\n### Workarounds\n\nRestrict network access to the WebSocket `/rpc` endpoint to trusted clients.","published":"2026-07-01T20:03:33Z","modified":"2026-09-04T21:00:07.717385114Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"surrealdb","fixedVersion":"3.1.0"}],"fix":{"url":"https://github.com/surrealdb/surrealdb/commit/1bd9826f477f4089134460dc5574b6f4e6916973","label":"surrealdb/surrealdb@1bd9826"},"references":[{"type":"WEB","url":"https://github.com/surrealdb/surrealdb/security/advisories/GHSA-q729-696q-g9pq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63760"},{"type":"WEB","url":"https://github.com/surrealdb/surrealdb/commit/1bd9826f477f4089134460dc5574b6f4e6916973"},{"type":"PACKAGE","url":"https://github.com/surrealdb/surrealdb"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/surrealdb-before-denial-of-service-via-json-parser"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-04T21:00:07.717385114Z"}}