SurrealDB has Denial of Service in JSON parser due to nested objects (CVE-2026-63760) | HOL Guard CVE

High · CVSS 7.5CVE-2026-63760GHSA-Q729-696Q-G9PQ

SurrealDB has Denial of Service in JSON parser due to nested objects

Answer in brief

CVE-2026-63760 records a High severity (CVSS 7.5) vulnerability in SurrealDB has Denial of Service in JSON parser due to nested objects. The current sources do not mark it as known exploited. The current feed maps surrealdb (rust). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 1, 2026Updated Sep 4, 2026Source checked Sep 4, 2026First seen by HOL Jul 1, 2026Material review Sep 4, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps surrealdb (rust). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
surrealdbrust	<3.1.0	3.1.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for surrealdb.
Review the reported fix. Update surrealdb to 3.1.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 1, 2026
Evidence: source:ghsa:source_dates:source-dates:record
Source modified
Sep 4, 2026
Evidence: source:ghsa:source_dates:source-dates:record
First seen by HOL
Jul 1, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.