Is CVE-2026-33203 actively exploited?

No active exploitation of CVE-2026-33203 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33203 be exploited remotely?

Yes. CVE-2026-33203 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33203?

CVE-2026-33203 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-33203

HIGH

CVE-2026-33203

CWE-248Published: March 20, 2026· Updated: Mar 23, 2026

7.5

CVSS v3.1

EPSS:0.10%probability of exploitation in 30 daysPercentile:27.6th

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.

NVD Source

Technical Analysis

CVE-2026-33203 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.