CVE-2026-63737 SurrealDB before 3.1.5 Denial of Service via deep operator chains

High 7.1 Published 20 Jul 2026 Updated 28 Jul 2026

Authenticated users can crash the SurrealDB server by submitting queries with excessively long operator chains, causing a stack overflow.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-63737?

CVE-2026-63737 is a high-severity denial of service vulnerability in Surrealdb Surrealdb, published on 20 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-674

Which versions are affected by CVE-2026-63737?

It affects 1 product.

Products include Surrealdb Surrealdb.

How do I fix CVE-2026-63737?

No fix has been published for CVE-2026-63737 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-63737 being exploited?

There is no known exploitation of CVE-2026-63737 in the wild and no public exploit code.

All Surrealdb Surrealdb vulnerabilities

Sources

Also known as GHSA-q3vg-g3wv-mfgg.