SurrealDB: HTTP /rpc sessions method leaks attached session UUIDs, enabling full session hijack by anonymous callers

Exploitation

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

CVSS

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

EPSS

• CVE-2026-63757: 0.54% estimated exploitation activity in the next 30 days; percentile 45.24 (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` `sessions` method returned every attached session UUID without authentication, and the `/rpc` handler accepted an arbitrary `session` field with no ownership check. An anonymous caller could enumerate UUIDs and impersonate any authenticated session. "Attached" means sessions registered via `{"method":"attach"}` — the only writer to the HTTP session map. Ordinary stateless `/rpc` requests use ephemeral per-request sessions that are filtered from `sessions()` and destroyed at end-of-request, so they are not enumerable.

Exposure - Exposed: clients that issue `attach`, notably the official Rust SDK's `Http`/`Https` engine (auto-attaches once per `Surreal` handle). - Not exposed: REST endpoints (`/sql`, `/key`, `/signin`, `/export`, etc.); WebSocket `/rpc` (per-connection scope, `attach` refused); embedded / MCP usage; ad-hoc `POST /rpc` callers that never `attach`.

Impact For each attached and authenticated session, an unauthenticated attacker can…

Published by the source

1 Jul 2026, 20:00 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-5qfp-32cf-69jh

2. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-5qfp-32cf-69jh

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# Patch Next advisory brief: CVE-2026-63757

Advisory: SurrealDB: HTTP /rpc `sessions` method leaks attached session UUIDs, enabling full session hijack by anonymous callers
IDs: CVE-2026-63757, GHSA-5qfp-32cf-69jh
Record: https://patchnext.com/advisories/ghsa-5qfp-32cf-69jh (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 8.8)
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-5qfp-32cf-69jh (GitHub-reviewed advisory GHSA-5qfp-32cf-69jh lists affected ranges: crates.io surrealdb >=0 <3.1.0)
- Verified: https://osv.dev/vulnerability/GHSA-5qfp-32cf-69jh (OSV record GHSA-5qfp-32cf-69jh lists affected ranges: crates.io surrealdb >=0 <3.1.0 (fixed))

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