Memory Amplification Vulnerability in SurrealDB by SurrealDB
CVE-2026-63750

6.9MEDIUM

Key Information:

Vendor

Surrealdb

Status
Surrealdb
Vendor
CVE Published:
20 July 2026

What is CVE-2026-63750?

Earlier versions of SurrealDB, prior to 3.1.0, have a vulnerability that fails to enforce the SURREAL_WEBSOCKET_MAX_MESSAGE_SIZE limit on anonymous /sql WebSocket connections. This flaw allows attackers to send excessively large WebSocket frames through multiple concurrent connections, potentially consuming excessive server memory and disrupting /sql availability. This could lead to performance degradation or a denial-of-service condition on the affected systems.

Affected Version(s)

surrealdb 0 < 3.1.0

surrealdb 3.1.0

References

https://github.com/surrealdb/surrealdb/security/advisorie...
vendor-advisory
https://www.vulncheck.com/advisories/surrealdb-before-mem...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.