---
id: GHSA-w47m-jpv2-qfw5
title: >-
  Duplicate Advisory: Knowns Sandbox Escape: Unauthenticated Header Injection
  Grants AI Agent Unrestricted Access to Host Filesystem
summary: >-
  Duplicate Advisory: Knowns Sandbox Escape: Unauthenticated Header Injection
  Grants AI Agent Unrestricted Access to Host Filesystem
severity: critical
cvss: 9.8
cwe:
  - CWE-73
vendor: knowns
product: knowns
ecosystem: npm
affected:
  - knowns < 0.31.0
published: '2026-09-10'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:11:38Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-w47m-jpv2-qfw5'
references:
  - url: >-
      https://github.com/knowns-dev/knowns/security/advisories/GHSA-9h2q-r9fh-f98w
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88899'
  - url: >-
      https://github.com/knowns-dev/knowns/commit/37db0561b37b48b8bd035a417d7f1da6258ae657
  - url: >-
      https://github.com/knowns-dev/knowns/blob/v0.30.0/internal/server/server.go#L1283-L1296
  - url: 'https://github.com/knowns-dev/knowns/releases/tag/v0.31.0'
  - url: >-
      https://www.vulncheck.com/advisories/knowns-before-0.31.0-external-control-of-agent-working-directory-via-x-opencode-directory-header
  - url: 'https://github.com/advisories/GHSA-w47m-jpv2-qfw5'
tags:
  - ghsa
  - npm
ingestedAt: '2026-09-25T17:13:14.006Z'
---

## Overview

### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-9h2q-r9fh-f98w. This link is maintained to preserve external references.

### Original Description
knowns versions before 0.31.0 fail to properly validate the x-opencode-directory request header in the /api/opencode proxy endpoint. Remote attackers can supply arbitrary directory paths to execute file operations outside the project root on the host system.

## Affected packages

- `knowns < 0.31.0`

## Remediation

Refer to the advisory for the patched release.