# CVE-2026-63756: SurrealDB before 3.1.0 Privilege Escalation via RPC Session Race Condition

> Unauthenticated attackers can hijack authenticated sessions via a race condition in the RPC endpoint to execute operations with elevated privileges.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/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-fmh9-9m2w-q5p4

## What is CVE-2026-63756?

CVE-2026-63756 is a critical 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 time-of-check/time-of-use race condition in the HTTP /rpc endpoint that allows unauthenticated requests to inherit authenticated session state. Unauthenticated attackers can send concurrent requests to the /rpc endpoint while legitimate authenticated traffic is active to execute operations with hijacked user privileges.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2026-63756?

It affects 1 product.


Products: Surrealdb Surrealdb.

## How do I fix CVE-2026-63756?

No fix has been published for CVE-2026-63756 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-63756 being exploited?

There is no known exploitation of CVE-2026-63756 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-2026-63747](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)
- [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-2026-63756 and fix it if it is affected.

What it is: CVE-2026-63756 is a critical 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-2026-63756 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-2026-63756/ (Markdown: https://insights.sbomify.com/CVE-2026-63756/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-63756
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-63756
- OSV: https://osv.dev/vulnerability/CVE-2026-63756

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-63756/
Summaries are generated and may contain mistakes; the official description above is the record.