CVE-2026-33203

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.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-20 | Updated 2026-03-23 | Assigner GitHub_M

Problem types

CWE-248: Uncaught Exception

CWE-306: Missing Authentication for Critical Function

Product status

References

github.com/...siyuan/security/advisories/GHSA-3g9h-9hp4-654v

cve.org (CVE-2026-33203)

nvd.nist.gov (CVE-2026-33203)

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