CVE-2026-63750
highpriority · track · 30EPSS 0.005 · 42 %ileEUUSEPSS · scored 2026-10-28
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 2.7–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (6)
External citations — patches, advisories, analysis.
- https://github.com/surrealdb/surrealdb/security/advisories/GHSA-65rj-r9fh-jp2vcnnvd
- https://www.vulncheck.com/advisories/surrealdb-before-memory-amplification-via-sql-websocketcnnvd
- https://github.com/surrealdb/surrealdb/security/advisories/GHSA-65rj-r9fh-jp2venisa_euvd
- https://www.vulncheck.com/advisories/surrealdb-before-memory-amplification-via-sql-websocketenisa_euvd
- https://github.com/surrealdb/surrealdb/security/advisories/GHSA-65rj-r9fh-jp2vVendor AdvisoryMitigationnvd
- https://www.vulncheck.com/advisories/surrealdb-before-memory-amplification-via-sql-websocketThird Party Advisorynvd
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