# SurrealDB vulnerable to pre-auth memory amplification via unbounded \`/sql\` WebSocket frames

Advisory record · `GHSA-65rj-r9fh-jp2v`

- **Identifiers:** `GHSA-65rj-r9fh-jp2v` · `CVE-2026-63750`
- **State:** Confirmed
- **Severity:** CVSS 6.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-770](https://cwe.mitre.org/data/definitions/770.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 1 Jul 2026
- **Updated:** 4 Nov 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 1 Jul 2026, 20:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `surrealdb` (crates.io): affected `<3.1.0`; fixed in `3.1.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> SurrealDB (crates.io surrealdb) versions before 3.1.0 are vulnerable. An anonymous remote caller can open many WebSocket connections to the /sql endpoint and stream frames far larger than the configured SURREAL_WEBSOCKET_MAX_MESSAGE_SIZE, because that limit is not applied there, which can exhaust memory and degrade availability. Upgrade to version 3.1.0 or later. If you cannot upgrade, block WebSocket upgrade requests to GET /sql at a reverse proxy or enforce per-connection frame size limits there.

Written 8 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.9 Medium, CVSS 4.0: `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`, from CNA (VulnCheck)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0049, the 42nd percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:18 UTC: First seen by agentprime
- 31 Oct 2026, 15:18 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-65rj-r9fh-jp2v)

## Sources

- [GitHub Advisory Database: GHSA-65rj-r9fh-jp2v](https://github.com/advisories/GHSA-65rj-r9fh-jp2v)
- [OSV: GHSA-65rj-r9fh-jp2v](https://osv.dev/vulnerability/GHSA-65rj-r9fh-jp2v)
- <https://github.com/surrealdb/surrealdb/security/advisories/GHSA-65rj-r9fh-jp2v>
- <https://github.com/surrealdb/surrealdb/commit/899967e6a9cf064c88a4bc4b35ea7e2da28a6411>
- <https://github.com/surrealdb/surrealdb>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-65rj-r9fh-jp2v>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-65rj-r9fh-jp2v/>. Everything for agents: <https://agentprime.io/llms.txt>.