CVE-2026-63750 | SurrealDB versions before 3.1.0 fail to apply the SURREAL_WE… | CVSS 5.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-63750
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-18 12:26 UTC
Published: 2026-07-20 12:04 UTC
Last updated: 2026-07-20 12:04 UTC
Primary CWE: CWE-770
Allocation of Resources Without Limits or Throttling
Vendor / Product: surrealdb / surrealdb
Sources: cve.org · NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products (1)

Vendor	Product	Platform	Versions
surrealdb	surrealdb	—	0 < 3.1.0, 3.1.0

Weakness (CWE)

CWE	Source	Description
CWE-770	cna	Allocation of Resources Without Limits or Throttling

CVSS scores (2)

Score	Severity	Version	Source	Vector
6.9	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.3	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References (2)

GitHub Security Advisory (GHSA-65rj-r9fh-jp2v) https://github.com/surrealdb/surrealdb/security/advisories/GHSA-65rj-r9fh-jp2v
VulnCheck Advisory: SurrealDB before 3.1.0 Memory Amplification via /sql WebSocket https://www.vulncheck.com/advisories/surrealdb-before-memory-amplification-via-sql-websocket