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CVE-2026-33203— SiYuan has an Unauthenticated WebSocket DoS via Auth Keepalive Bypass

CVSS 7.5 · High EPSS 0.07% · P20
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I. Basic Information for CVE-2026-33203

Vulnerability Information
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Vulnerability Title
SiYuan has an Unauthenticated WebSocket DoS via Auth Keepalive Bypass
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未捕获的异常
Source: NVD (National Vulnerability Database)
Vulnerability Title
SiYuan 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.6.2之前版本存在访问控制错误漏洞，该漏洞源于WebSocket服务器接受未经身份验证的连接，且未对攻击者控制的JSON进行类型检查，可能导致远程攻击者发送恶意消息触发运行时崩溃，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
siyuan-notesiyuan < 3.6.2 -

II. Public POCs for CVE-2026-33203

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III. Intelligence Information for CVE-2026-33203

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Same Patch Batch · siyuan-note · 2026-03-20 · 8 CVEs total

CVE-2026-329389.9 CRITICALSiYuan has an Arbitrary File Read in its Desktop Publish Service
CVE-2026-327679.8 CRITICALSiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API
CVE-2026-329409.3 CRITICALSiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CV
CVE-2026-334767.5 HIGHSiYuan has an Unauthenticated Arbitrary File Read via Path Traversal
CVE-2026-331946.8 MEDIUMSiYuan has an Incomplete Fix for IsSensitivePath Denylist Allows File Read from /opt, /usr
CVE-2026-33067SiYuan has Stored XSS to RCE via Unsanitized Bazaar Package Metadata
CVE-2026-33066SiYuan has Stored XSS to RCE via Unsanitized Bazaar README Rendering

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-248

V. Comments for CVE-2026-33203

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