{"id":"CVE-2026-123492","published":"2026-11-06T15:17:18.830","lastModified":"2026-11-09T23:17:15.640","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.","cvssScore":4.9,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-476"],"vendors":[],"products":[],"references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2x3p-x74g-442x","tags":[]},{"url":"https://www.vulncheck.com/advisories/siyuan-before-3.8.9-nil-pointer-dereference-dos-via-mcp-resources-read","tags":[]}],"exploitRefs":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2x3p-x74g-442x","tags":[]}],"hasPoc":true,"ai":null}