Vulnerability · Published Jul 20, 2026 · Assigned by VulnCheck

CVE-2026-63750SurrealDB before 3.1.0 Memory Amplification via /sql WebSocket

Medium 5.3

In plain English

A medium-severity resource allocation without limits in surrealdb from surrealdb. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.5%top 57.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

SurrealDB versions before 3.1.0 fail to apply the SURREAL_WEBSOCKET_MAX_MESSAGE_SIZE limit to anonymous /sql WebSocket connections, allowing attackers to buffer unbounded frames in the per-connection read buffer. Attackers can stream WebSocket frames larger than the configured limit across multiple concurrent connections to consume excessive memory and degrade /sql availability.

Affected products (as reported)

Vendor	Product	Versions
surrealdb	surrealdb	0 – before 3.1.0

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

GitHub Security Advisory (GHSA-65rj-r9fh-jp2v) vendor-advisory
VulnCheck Advisory: SurrealDB before 3.1.0 Memory Amplification via /sql WebSocket third-party-advisory