CVE-2026-86439
High
Description
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.
SeverityHigh
CVSS8.8
Exploit probability—
ProductKnowns
PublishedSep 7, 2026
First seenSep 7, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- knowns0.30.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| knownsnpm | v < 0.30.0 | 0.30.0 |
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