GHSA-3g9h-9hp4-654v · Severity: high · Ecosystem: go — SiYuan has an Unauthenticated WebSocket DoS via Auth Keepalive Bypass
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.
Conclusion & alert: CVE-2026-33203 is rated Exploit Available (52.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.07%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-01 | 0.05% | 0.07% | +0.02% |
| 2 | 2026-04-21 | 0.10% | 0.05% | -0.05% |
| 3 | 2026-03-21 | — | 0.10% | — |
Full EPSS history (3 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
GHSA-3g9h-9hp4-654v · Severity: high · Ecosystem: go — SiYuan has an Unauthenticated WebSocket DoS via Auth Keepalive Bypass
| URL | Tags |
|---|---|
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3g9h-9hp4-654v | Exploit Vendor Advisory |