{"id":"CVE-2026-63760","aliases":["GHSA-q729-696q-g9pq"],"title":"SurrealDB has Denial of Service in JSON parser due to nested objects","summary":"SurrealDB has Denial of Service in JSON parser due to nested objects","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"surrealdb","product":"surrealdb","ecosystem":"rust","affected":["surrealdb < 3.1.0"],"patched":["surrealdb 3.1.0"],"published":"2026-07-01","updated":"2026-09-04","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-q729-696q-g9pq","references":[{"url":"https://github.com/surrealdb/surrealdb/security/advisories/GHSA-q729-696q-g9pq"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63760"},{"url":"https://github.com/surrealdb/surrealdb/commit/1bd9826f477f4089134460dc5574b6f4e6916973"},{"url":"https://github.com/surrealdb/surrealdb"},{"url":"https://www.vulncheck.com/advisories/surrealdb-before-denial-of-service-via-json-parser"}],"tags":["osv","rust"],"epss":0.00515,"epssPercentile":0.41405,"ingestedAt":"2026-09-05T19:33:50.390Z","slug":"CVE-2026-63760","body":"## Overview\n\nThe 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.\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":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}