Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
SurrealDB (crates.io surrealdb) versions before 3.1.0 are vulnerable. An anonymous remote caller can open many WebSocket connections to the /sql endpoint and stream frames far larger than the configured SURREAL_WEBSOCKET_MAX_MESSAGE_SIZE, because that limit is not applied there, which can exhaust memory and degrade availability. Upgrade to version 3.1.0 or later. If you cannot upgrade, block WebSocket upgrade requests to GET /sql at a reverse proxy or enforce per-connection frame size limits there.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.9 | Medium | 4.0 | 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 | CNA (VulnCheck) |
- CISA KEV Not listed.
- EPSS 0.0049, the 42nd percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:18 UTC First seen by agentprime
- 31 Oct 2026, 15:18 UTC Confirmed by OSV