Vulnerability details
CVE-2026-33203
siyuan-note siyuan
SiYuan has an Unauthenticated WebSocket DoS via Auth Keepalive Bypass
CVSS 3.1
7.5High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| siyuan-note | siyuan | < 3.6.2 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3g9h-9hp4-654v x_refsource_CONFIRM
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Details
- Published
- 2026-03-21
- Last updated
- 2026-03-23
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.52%
Probability of exploitation in 30 days
44.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-248Uncaught Exception
- CWE-306Missing Authentication for Critical Function