Medium severity4.9NVD Advisory· Published Nov 6, 2026· Updated Nov 6, 2026

CVE-2026-123492

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.

Affected products

Siyuan Note/Siyuanllm-fuzzy
Range: <3.8.9

Patches

Vulnerability mechanics

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-2x3p-x74g-442xnvd
www.vulncheck.com/advisories/siyuan-before-3.8.9-nil-pointer-dereference-dos-via-mcp-resources-readnvd

News mentions

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cvss	0.319
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000