# CVE-2026-63747: SurrealDB before 3.1.0 Denial of Service via malformed RPC use

> Unauthenticated attackers can crash the SurrealDB server by sending malformed WebSocket messages to the RPC endpoint.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Jul 2026
- **Updated:** 28 Jul 2026
- **Also known as:** GHSA-j7ww-7h79-mmf6

## What is CVE-2026-63747?

CVE-2026-63747 is a high-severity denial of service vulnerability in Surrealdb Surrealdb, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

SurrealDB versions before 3.1.0 contain a denial of service vulnerability in the RPC use handler that panics when db is set without a namespace. Unauthenticated attackers can send a malformed WebSocket message to the /rpc endpoint to crash the server process.

Weakness: CWE-248 (Uncaught Exception)

## Which versions are affected by CVE-2026-63747?

It affects 1 product.


Products: Surrealdb Surrealdb.

## How do I fix CVE-2026-63747?

No fix has been published for CVE-2026-63747 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-63747 being exploited?

There is no known exploitation of CVE-2026-63747 in the wild and no public exploit code.

## Other vulnerabilities in Surrealdb Surrealdb

- [CVE-2025-71392](https://insights.sbomify.com/CVE-2025-71392/): SurrealDB before 2.2.2 SurrealQL Injection via export (critical 9.4)
- [CVE-2026-63756](https://insights.sbomify.com/CVE-2026-63756/): SurrealDB before 3.1.0 Privilege Escalation via RPC Session Race Condition (critical 9.2)
- [CVE-2026-63757](https://insights.sbomify.com/CVE-2026-63757/): SurrealDB before 3.1.0 Session Hijacking via /rpc sessions (high 8.7)
- [CVE-2026-63760](https://insights.sbomify.com/CVE-2026-63760/): SurrealDB before 3.1.0 Denial of Service via JSON Parser (high 8.7)
- [CVE-2023-54366](https://insights.sbomify.com/CVE-2023-54366/): SurrealDB before 1.0.1 Insecure Default Table Permissions (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-63747 and fix it if it is affected.

What it is: CVE-2026-63747 is a high-severity denial of service vulnerability in Surrealdb Surrealdb, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-63747 in the wild and no public exploit code.

Affected product: Surrealdb Surrealdb. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-63747/ (Markdown: https://insights.sbomify.com/CVE-2026-63747/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-63747
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-63747
- OSV: https://osv.dev/vulnerability/CVE-2026-63747

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-63747/
Summaries are generated and may contain mistakes; the official description above is the record.