CVE-2026-63747
Unauthenticated WebSocket /rpc crash (DoS) in SurrealDB <3.1.0
Is CVE-2026-63747 being exploited?
Not confirmed. CVE-2026-63747 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.52% probability of exploitation in the next 30 days.
How severe is CVE-2026-63747?
CVE-2026-63747 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-63747?
Yes. A fix has been recorded for CVE-2026-63747. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-63747 affect?
CVE-2026-63747 affects SurrealDB < 3.1.0, SurrealDB server /rpc WebSocket endpoint, Self-hosted SurrealDB instances. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-63747?
Upgrade SurrealDB to 3.1.0 or apply vendor fix; restrict /rpc WebSocket access
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can send a malformed WebSocket /rpc message to crash the SurrealDB server process, causing denial of service.
Immediate action required
- affected< 3.1.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.