CVE-2026-63756

critical · 9.2

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.

9.2

CVSS

0.4%

EPSS (exploit prob.)

31st

EPSS percentile

2026-07-20

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-362

Affected products

Vendor	Product	Affected versions
surrealdb	surrealdb	< 3.1.0

Check a specific version with /api/v1/cve/match.

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-63756