EUVD-2026-292285

fkie_cve-2026-35570

OpenClaude is an open-source coding-agent command line interface for cloud and local model providers. Versions prior to 0.5.1 have a logic flaw in `bashToolHasPermission()` inside `src/tools/BashTool/bashPermissions.ts`. When the sandbox auto-allow feature is active and no explicit deny rule is configured, the function returns an `allow` result immediately — before the path constraint filter (`checkPathConstraints`) is ever evaluated. This allows commands containing path traversal sequences (e.g., `../../../../../etc/passwd`) to bypass directory restrictions entirely. Version 0.5.1 contains a patch for the issue.

GHSA-m6rx-7pvw-2f73 — OpenClaude: Sandbox Bypass via Early-Exit Logic Flaw Allows Path Traversal

Affected: npm: @gitlawb/openclaude

A logic flaw exists in `bashToolHasPermission()` inside `src/tools/BashTool/bashPermissions.ts`. When the sandbox auto-allow feature is active and no explicit deny rule is configured, the function returns an `allow` result immediately — before the path constraint filter (`checkPathConstraints`) is ever evaluated. This allows commands containing path traversal sequences (e.g., `../../../../../etc/passwd`) to bypass directory restrictions entirely.

## Affected Component

- **File:** `src/tools/BashTool/bashPermissions.ts` - **Function:** `bashToolHasPermission` - **Location:** ~line 1445 (sandbox auto-allow block)

## Vulnerable Code Flow

``` bashToolHasPermission() │ ├─ [~1445] Sandbox auto-allow block │ └─ No deny rule found → return ALLOW ⚠️ Early exit │ └─ [~1644] checkPathConstraints() ❌ Never reached ```

The sandbox block was designed to skip interactive permission prompts in sandboxed environments. However, it unintentionally also skips the path traversal filter, which is a separate and critical security control.

## Impact

Any process or user operating in a sandboxed session with no explicit deny rules can:

- Read arbitrary files outside the sandbox boundary (e.g., `/etc/passwd`, `/etc/shadow`, `.env` files, SSH private keys) - Write to arbitrary paths (subject to OS-level permissions) - Fully defeat the filesystem isolation that the sandbox is intended to enforce

## Steps to Reproduce

1. Enable sandbox mode: `SandboxManage…

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EUVD-2026-292285

fkie_cve-2026-35570

GHSA-m6rx-7pvw-2f73 — OpenClaude: Sandbox Bypass via Early-Exit Logic Flaw Allows Path Traversal