CVE-2026-33203
High
Description
SiYuan is a personal knowledge management system. Prior to version 3.6.2, the SiYuan kernel WebSocket server accepts unauthenticated connections when a specific "auth keepalive" query parameter is present. After connection, incoming messages are parsed using unchecked type assertions on attacker-controlled JSON. A remote attacker can send malformed messages that trigger a runtime panic, potentially crashing the kernel process and causing denial of service. Version 3.6.2 fixes the issue.
SeverityHigh
CVSS7.5
Exploit probability—
ProductB3log Siyuan
PublishedMar 20, 2026
First seenMar 20, 2026
How to fix
Update
- b3log siyuan3.6.2 or later
- github.com/siyuan-note/siyuan/kernel3.6.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| b3log siyuan | v < 3.6.2 | 3.6.2 |
| github.com/siyuan-note/siyuan/kernelGo | v < 3.6.2, No range specified | 3.6.2 |
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