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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| siyuan-note | siyuan | < 3.8.9 | 3.8.9 |
References
- GitHub Security Advisory (GHSA-2x3p-x74g-442x) vendor-advisory
- VulnCheck Advisory: SiYuan before 3.8.9 Nil Pointer Dereference DoS via MCP resources/read third-party-advisory