CVE-2026-33203
SiYuan has an Unauthenticated WebSocket DoS via Auth Keepalive Bypass
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-248 CWE-306 |
| Vendor | siyuan-note |
| Product | siyuan |
| Published | Mar 20, 2026 |
| Last Updated | Mar 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
siyuan-note / siyuan
< 3.6.2