SurrealDB unauthenticated remote DoS in RPC use handler

Severity: high · CVSS 7.5 · Published 2026-07-01

SurrealDB is a multi-model cloud database. A vulnerability in its remote communication protocol allows an unauthenticated attacker to crash the database server with a single specially crafted message. This results in a complete denial of service, potentially disrupting all applications and services relying on the database.

Technologies: surrealdb (crates.io). Vendors: crates.io.

Quick answers

Is This vulnerability exploited in the wild?
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
High severity, with a CVSS score of 7.5, published 1 July 2026.
Which products and versions are affected?
surrealdb (crates.io) < 3.1.0.
Is there a fix for This vulnerability?
A patch was published on 2026-07-01: Version 3.1.0 released with fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is This vulnerability attacked?
It is attacked over the network, in a software library.
Am I affected?
Check whether you run surrealdb (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A vulnerability exists in the SurrealDB RPC handler where a WebSocket message calling the `use` method with a database (`db`) parameter, but without a previously established namespace (`ns`), triggers an unhandled panic. Specifically, the code calls `.expect()` on a None value in `surrealdb-core/src/rpc/protocol.rs`. Because the project is compiled with `panic = 'abort'`, this panic immediately terminates the entire server process. The attack requires no authentication or special capabilities, as the `use` method is accessible to guest callers by default. The issue is resolved in version 3.1.0 by returning a proper error response instead of panicking.

Affected products

  • SurrealDB surrealdb < 3.1.0

Timeline

  • 2026-05-27: disclosed: Initial disclosure by researcher
  • 2026-07-01: advisory: GitHub Advisory published
  • 2026-07-01: patched: Version 3.1.0 released with fix

References

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