GHSA-Q729-696Q-G9PQ
Vulnerability from github – Published: 2026-07-01 20:03 – Updated: 2026-09-04 20:47The 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.
This is an incomplete fix for 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.
Impact
An unauthenticated remote attacker can crash a SurrealDB server with a single WebSocket message. No credentials or query execution privileges are required.
Patches
A patch enforces the configured recursion depth limit in parse_value and parse_json, bringing them in line with the rest of the parser.
- Versions 3.1.0 and later are not affected by this issue.
Workarounds
Restrict network access to the WebSocket /rpc endpoint to trusted clients.
{
"affected": [
{
"package": {
"ecosystem": "crates.io",
"name": "surrealdb"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.1.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-63760"
],
"database_specific": {
"cwe_ids": [
"CWE-674"
],
"github_reviewed": true,
"github_reviewed_at": "2026-07-01T20:03:33Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"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.",
"id": "GHSA-q729-696q-g9pq",
"modified": "2026-09-04T20:47:50Z",
"published": "2026-07-01T20:03:33Z",
"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"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "SurrealDB has Denial of Service in JSON parser due to nested objects"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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