CVE-2026-33203 Details
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.
A denial-of-service vulnerability has been identified in the SiYuan personal knowledge management system, in versions prior to 3.6.2. The issue arises in the SiYuan kernel WebSocket server, which accepts unauthenticated connections when the 'auth keepalive' query parameter is included. Once a connection is established, the server parses incoming messages using unchecked type assertions on attacker-controlled JSON. This flaw allows remote attackers to send malformed messages that trigger a runtime panic, potentially crashing the kernel process and causing a denial-of-service condition.
Users should upgrade to SiYuan version 3.6.2 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 23, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3g9h-9hp4-654v | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-248 | Uncaught Exception | [email protected] |
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| b3log siyuan | < 3.6.2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 23, 2026 | Initial Analysis | [email protected] |
| Mar 20, 2026 | New CVE Received | [email protected] |