What is CVE-2026-63737?

CVE-2026-63737 is a medium-severity vulnerability in Surrealdb, classified under Uncontrolled Recursion. CVSS score: 6.5/10. Published 2026-07-20.

How severe is CVE-2026-63737?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Surrealdb

CVE-2026-63737

SurrealDB versions before 3.1.5 contain a denial of service vulnerability where authenticated users can crash the server with queries containing long chains of operators. Attackers can submit queries with tens of thousands of chained operators that create unbounded expression trees, causing stack overflow during query processing and aborting the entire process.

EPSS: 0.005 (40.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Surrealdb — versions 3.0.0, 3.1.5

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

disclosure@vulncheck.com (vendor-advisory, Mitigation, Vendor Advisory)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-63737?: CVE-2026-63737 is a medium-severity vulnerability in Surrealdb, classified under Uncontrolled Recursion. CVSS score: 6.5/10. Published 2026-07-20.
How severe is CVE-2026-63737?: Medium severity. CVSS v3 base score is 6.5 out of 10.