# CVE-2026-63750: SurrealDB before 3.1.0 Memory Amplification via /sql WebSocket

> Attackers can exhaust memory via unbounded WebSocket frames in SurrealDB, causing denial of service for SQL endpoints.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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-qg3v-r4m7-x5f5

## What is CVE-2026-63750?

CVE-2026-63750 is a medium-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 fail to apply the SURREAL_WEBSOCKET_MAX_MESSAGE_SIZE limit to anonymous /sql WebSocket connections, allowing attackers to buffer unbounded frames in the per-connection read buffer. Attackers can stream WebSocket frames larger than the configured limit across multiple concurrent connections to consume excessive memory and degrade /sql availability.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2026-63750?

It affects 1 product.


Products: Surrealdb Surrealdb.

## How do I fix CVE-2026-63750?

No fix has been published for CVE-2026-63750 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-63750 being exploited?

There is no known exploitation of CVE-2026-63750 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-2026-63747](https://insights.sbomify.com/CVE-2026-63747/): SurrealDB before 3.1.0 Denial of Service via malformed RPC use (high 8.7)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-63750 and fix it if it is affected.

What it is: CVE-2026-63750 is a medium-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-2026-63750 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-2026-63750/ (Markdown: https://insights.sbomify.com/CVE-2026-63750/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-63750
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-63750
- OSV: https://osv.dev/vulnerability/CVE-2026-63750

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-63750/
Summaries are generated and may contain mistakes; the official description above is the record.