---
id: GHSA-qjrq-cvv4-3g9w
title: >-
  Duplicate Advisory: Knowns Unrestricted Path Traversal leading to
  out-of-bounds arbitrary .md file read, write, and deletion in MCP Docs +
  Memory Tools
summary: >-
  Duplicate Advisory: Knowns Unrestricted Path Traversal leading to
  out-of-bounds arbitrary .md file read, write, and deletion in MCP Docs +
  Memory Tools
severity: high
cvss: 8.8
cwe:
  - CWE-22
vendor: knowns
product: knowns
ecosystem: npm
affected:
  - knowns < 0.30.0
published: '2026-09-08'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:25:52Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-qjrq-cvv4-3g9w'
references:
  - url: >-
      https://github.com/knowns-dev/knowns/security/advisories/GHSA-9gfj-28hw-jchp
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86439'
  - url: >-
      https://github.com/knowns-dev/knowns/commit/09c5a96fd5817b941dc86669278c1a17db10ed4e
  - url: >-
      https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/doc_store.go#L124-L129
  - url: >-
      https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/memory_store.go#L203-L211
  - url: 'https://github.com/knowns-dev/knowns/releases/tag/v0.30.0'
  - url: >-
      https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-mcp-doc-and-memory-tools
  - url: 'https://github.com/advisories/GHSA-qjrq-cvv4-3g9w'
tags:
  - ghsa
  - npm
ingestedAt: '2026-09-25T18:14:20.399Z'
---

## Overview

## Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-9gfj-28hw-jchp. This link is maintained to preserve external references.

## Original Advisory

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 packages

- `knowns < 0.30.0`

## Remediation

Refer to the advisory for the patched release.