Dashboard / CVE-2026-123492

CVE-2026-123492

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 59/100
Published: 2026-11-06 Modified: 2026-11-09 First seen: 2026-11-06 Status: active

Attack Surface

Network Low Complexity No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: High
UI: None
AT: None
VC: None
VI: None
VA: High

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
siyuan-note siyuan 0 < 3.8.9
siyuan-note siyuan 0 < 3.8.9

References & Advisories (2)

Bug Bounty Relevance

59 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

6.9 / 10.0 v4.0
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

EPSS — Exploitation Probability

0.27%
Raw Score 0.002660
Percentile 18.9%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00266
2026-11-12
0.00266
2026-11-10
0.00266
2026-11-09
0.00266
2026-11-08
0.00266
2026-11-07
0.00266

Intelligence Sources

mitre ref →
nvd ref →

External Links