SurrealDB: HTTP RPC Session Race Condition Allows Privilege Escalation

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.1 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2026-63756: 0.37% estimated exploitation activity in the next 30 days; percentile 30.76 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

The HTTP `/rpc` endpoint has a time-of-check/time-of-use (TOCTOU) race condition on internal session state. When authenticated and unauthenticated requests are processed concurrently, the unauthenticated request can inherit the authenticated user's session and privileges. The `/rpc` endpoint is the primary interface used by all official SurrealDB SDKs. The HTTP `/rpc` handler does not bind each incoming request to an isolated session context. Instead, concurrent requests share mutable authentication state. When an authenticated request sets the session context and an unauthenticated request races in before it is cleared, the unauthenticated request executes with the authenticated user's privileges. The impact depends on the privilege level of the session that is hijacked. If a root or namespace-level user session is inherited, the attacker can read and modify any data, delete records, and create persistent namespace-level users. If a scoped record user session is inherited, the…

Published by the source

1 Jul 2026, 20:02 UTC

Last modified by the source

4 Nov 2026, 02:56 UTC

Source last checked

4 Nov 2026, 06:30 UTC

1. Revision 2 · amended · 4 Nov 2026

   Amended from osv record GHSA-4vgr-h27g-cf9p

2. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-4vgr-h27g-cf9p

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# Patch Next advisory brief: CVE-2026-63756

Advisory: SurrealDB: HTTP RPC Session Race Condition Allows Privilege Escalation
IDs: CVE-2026-63756, GHSA-4vgr-h27g-cf9p
Record: https://patchnext.com/advisories/ghsa-4vgr-h27g-cf9p (revision 2, source checked 4 Nov 2026, 06:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: surrealdb 3.1.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io surrealdb: affected < 3.1.0; fixed in 3.1.0

## Suggested inspection (read-only)
- crates.io surrealdb: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on surrealdb.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-4vgr-h27g-cf9p (GitHub-reviewed advisory GHSA-4vgr-h27g-cf9p lists affected ranges: crates.io surrealdb >=0 <3.1.0)
- Verified: https://osv.dev/vulnerability/GHSA-4vgr-h27g-cf9p (OSV record GHSA-4vgr-h27g-cf9p lists affected ranges: crates.io surrealdb >=0 <3.1.0 (fixed))

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