CVE-2026-123492

MediumCVSS 4.9/10Last modified Nov 6, 2026

Description

SiYuan before 3.8.9 contains a nil pointer dereference vulnerability in privateCacheMiddleware that allows authenticated attackers to crash the kernel by reading nonexistent MCP resources. Attackers with a valid API token can send a resources/read request in an initialized MCP session, causing a panic that terminates the kernel process and interrupts service.

Metrics

CVSS 3.1 4.9/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-476

Affected software

No affected versions have been published.

Timeline

Published
Nov 6, 2026
Last modified
Nov 6, 2026
NVD status
Deferred

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CVE-2026-123492: Medium severity, CVSS 4.9 | Vulnix