CVE-2026-86439: Knowns-Dev Knowns

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory traversal sequences to access arbitrary Markdown files accessible to the server process.

Affected products

• Knowns-Dev Knowns: before 0.30.0 (fixed in 0.30.0)

Published 2026-09-07. Last modified 2026-09-08.