CVE-2026-101091: Siyuan-Note Siyuan

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

SiYuan versions before v3.8.4 fail to properly validate SQL statements in block query embed blocks executed against siyuan.db. Attackers can craft malicious .sy documents with non-read-only SQL statements that execute automatically during background indexing, rendering, or export operations without authentication.

Affected products

• Siyuan-Note Siyuan: before 3.8.4 (fixed in 3.8.4)

Published 2026-09-28. Last modified 2026-09-29.