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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Affected Vendors & Products
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Fri, 06 Nov 2026 17:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Siyuan
Siyuan siyuan |
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| Vendors & Products |
Siyuan
Siyuan siyuan |
Fri, 06 Nov 2026 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | SiYuan before 3.8.9 Nil Pointer Dereference DoS via MCP resources/read | |
| First Time appeared |
B3log
B3log siyuan |
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| Weaknesses | CWE-476 | |
| CPEs | cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* | |
| Vendors & Products |
B3log
B3log siyuan |
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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-11-06T15:00:52.853Z
Reserved: 2026-11-06T00:44:37.659Z
Link: CVE-2026-123492
No data.
Status : Deferred
Published: 2026-11-06T15:17:18.830
Modified: 2026-11-06T15:17:18.963
Link: CVE-2026-123492
No data.
OpenCVE Enrichment
Updated: 2026-11-06T17:00:09Z
Weaknesses