CVE-2026-63760: Surrealdb Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-q729-696q-g9pq
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CVSS 7.5
CWE-674
Published
Advisory Summary

CVE-2026-63760 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-674: Uncontrolled Recursion) affecting Surrealdb libraries in the crates.io ecosystem. The issue involves surrealdb has denial of service in json parser due to nested objects. Remediation is available by upgrading affected packages to version 3.1.0.

CVE-2026-63760 at a Glance

CVE Identifier CVE-2026-63760
GHSA Identifier GHSA-q729-696q-g9pq
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-674: Uncontrolled Recursion
Affected Product Surrealdb
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-63760

To remediate this vulnerability, upgrade all affected Surrealdb dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

surrealdb fixed: 3.1.0 
Upgrade surrealdb to 3.1.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for surrealdb

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-63760, inspect your project dependencies for Surrealdb:

inspect dependencies for surrealdb

Analyze the terminal output to locate any version of Surrealdb in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-674: Uncontrolled Recursion, where the product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. In Surrealdb, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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. This 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. ### 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.

CVE-2026-63760 Affected Surrealdb Versions

1 component(s)
Fixed Versions:
3.1.0
Product / Package Ecosystem Affected Versions Fixed Version
surrealdb
 crates.io
< 3.1.0
3.1.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/surrealdb/surrealdb/security/advisories/GHSA-q729-696q-g9pq
NVD — CVE-2026-63760 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63760
Security Fix Commit FIX COMMIT
https://github.com/surrealdb/surrealdb/commit/1bd9826f477f4089134460dc5574b6f4e6916973
Surrealdb Source Repository REPOSITORY
https://github.com/surrealdb/surrealdb
www.vulncheck.com/advisories/surreald... WEB
https://www.vulncheck.com/advisories/surrealdb-before-denial-of-service-via-json-parser

Frequently Asked Questions

What is CVE-2026-63760?
CVE-2026-63760 is a security vulnerability in Surrealdb involving SurrealDB has Denial of Service in JSON parser due to nested objects under CWE-674: Uncontrolled Recursion.
Which Surrealdb versions are affected?
Affected versions include releases prior to 3.1.0 across affected packages: surrealdb.
What version fixes CVE-2026-63760?
Upgrading to 3.1.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is surrealdb affected?
Yes, surrealdb is affected in releases prior to 3.1.0. Upgrade your dependency to 3.1.0 or later.
What is the CVSS score of CVE-2026-63760?
CVE-2026-63760 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-63760?
CVE-2026-63760 is classified under CWE-674: Uncontrolled Recursion (The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.).
How can I check crates.io dependencies for CVE-2026-63760?
Run the dependency tree command: 'inspect dependencies for surrealdb'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q729-696q-g9pq",
  "modified" : "2026-09-04T20:47:50Z",
  "published" : "2026-07-01T20:03:33Z",
  "aliases" : [ "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "surrealdb"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.0"
      } ]
    } ]
  } ],
  "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-674" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-01T20:03:33Z",
    "nvd_published_at" : null
  }
}