CVE-2026-63760 is a high-severity (CVSS 7.5) CWE-674 vulnerability in surrealdb. A fix is available for surrealdb — see the affected versions and patch details below.
SurrealDB has Denial of Service in JSON parser due to nested objects
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-63760.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-63760 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 391,411 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
surrealdbReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.
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, 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 Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | surrealdb | all versions | 3.1.0cargo update -p surrealdb --precise 3.1.0 |
Affected Products
surrealdbsurrealdbDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for surrealdb, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update surrealdb to 3.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-63760 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is CVE-2026-63760 in your dependencies?
Find it across crates.io, including transitive dependencies.