CVE-2026-63759Network attack vector

Authenticated server crash via unbounded type recursion

Published Jul 20, 2026 · Updated Jul 20, 2026

Uncontrolled recursion in SurrealDB before 3.1.0 allows remote authenticated users to crash the server via nested type annotations. The kind parser omits the configured recursion guard around parse_concrete_kind and parse_inner_kind, allowing recursive OPTION and array types to exhaust memory. Query execution privileges and WebSocket /rpc access are required; one crafted message terminates the process without reported data disclosure or modification.

CVSS severity7.1
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Uncontrolled recursion in SurrealDB before 3.1.0 allows remote authenticated users to crash the server via nested type annotations. The kind parser omits the configured recursion guard around parse_concrete_kind and parse_inner_kind, allowing recursive OPTION and array types to exhaust memory. Query execution privileges and WebSocket /rpc access are required; one crafted message terminates the process without reported data disclosure or modification.

The record

CVE
CVE-2026-63759
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
SurrealDB
Product
SurrealDB
Classifications
CWE-674, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SurrealDB · SurrealDBversion=0 <3.1.0

Published CVSS scores

6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo