CVE-2026-63756

EUVD-2026-45927
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.
Race Condition
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.1 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 29.82%
Affected Products (NVD)
VendorProductVersion
surrealdbsurrealdb
𝑥
< 3.1.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/surrealdb/surrealdb/security/advisories/GHSA-4vgr-h27g-cf9p
https://www.vulncheck.com/advisories/surrealdb-before-privilege-escalation-via-rpc-session-race-condition