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GHSA-4vgr-h27g-cf9p
No affected components available
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 attacker is limited to that user's permissions.
The attack requires no credentials, tokens, or session knowledge — only the ability to send concurrent HTTP requests to the /rpc endpoint while legitimate authenticated traffic is active.
Impact
An unauthenticated attacker who can reach the /rpc endpoint can escalate privileges by racing against any active authenticated session. The severity of the impact depends on the permissions of the user whose session was hijacked. This could include escalation to root user of SurrealDB instance
Patches
Versions prior to SurrealDB v3.1.0 are vulnerable.
A patch has been introduced that replaces the shared default session with per-request session isolation. Every POST /rpc request now allocates a fresh, server-side UUID and runs entirely within that session's scope for the duration of the request. The session-map signatures across the RPC protocol have been changed from Option<Uuid> to Uuid so the "default session" can no longer be represented at the type level, preventing future regressions of the same shape.
Workarounds
There is no configuration-level mitigation that fully addresses this vulnerability. Network-level controls restricting access to the /rpc endpoint to trusted clients can reduce exposure.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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