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Advisories

SiYuan before 3.8.9 Nil Pointer Dereference DoS via MCP resources/read

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Severity
medium
Date
Affecting

  • siyuan >= 0, < 3.8.9

CWE
  • CWE-476 NULL Pointer Dereference
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
xy3xy3
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.

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