VDB
CVE-2026-33203
CVE-2026-33203
PUBLISHED
CVSS 7.5 HIGH
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.
EPSS 0.07% · 21.5th percentile
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.07%
21.5th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| b3log | siyuan | 0, 0 |
| siyuan-note | siyuan | < 3.6.2, < 3.6.2 |
| github.com | siyuan-note/siyuan/kernel | 0, 0 |
Exploit Intelligence
- CIRCL seen: CVE-2026-33203 (circl-sighting)
- CIRCL seen: CVE-2026-33203 (circl-sighting)
- CIRCL seen: CVE-2026-33203 (circl-sighting)
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3g9h-9hp4-654v (nist-nvd)
Timeline
- Mar 18, 2026 CVE Published
- Mar 19, 2026 Security Advisory
- Mar 20, 2026 PoC Published
- Mar 21, 2026 EPSS Score
- Mar 21, 2026 PoC Published
- Mar 22, 2026 EPSS Score
- Mar 23, 2026 EPSS Score
- Mar 24, 2026 EPSS Score
- Mar 24, 2026 PoC Published
- Mar 25, 2026 CVE Updated
- Mar 25, 2026 EPSS Score
- May 18, 2026 EPSS Score