CVE-2026-63756 | SurrealDB versions before 3.1.0 contain a time-of-check/time… | CVSS 8.1 HIGH

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.

Metadata

CVE ID: CVE-2026-63756
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-18 12:30 UTC
Published: 2026-07-20 12:04 UTC
Last updated: 2026-07-20 12:04 UTC
Primary CWE: CWE-362
Concurrent Execution using Shared Resource with Improper Syn…
Vendor / Product: surrealdb / surrealdb
Sources: cve.org · NVD

Severity & Metrics

8.1 HIGH CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
surrealdb	surrealdb	—	0 < 3.1.0, 3.1.0

Weakness (CWE)

CWE	Source	Description
CWE-362	cna	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.2	CRITICAL	4.0	cna	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
8.1	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References (2)

GitHub Security Advisory (GHSA-4vgr-h27g-cf9p) https://github.com/surrealdb/surrealdb/security/advisories/GHSA-4vgr-h27g-cf9p
VulnCheck Advisory: SurrealDB before 3.1.0 Privilege Escalation via RPC Session Race Condition https://www.vulncheck.com/advisories/surrealdb-before-privilege-escalation-via-rpc-session-race-condition