Vulnerability-Lookup

CVE-2026-35570 (GCVE-0-2026-35570)

Vulnerability from cvelistv5 – Published: 2026-04-20 23:24 – Updated: 2026-04-21 19:49

Title

OpenClaude has Sandbox Bypass via Early-Exit Logic Flaw that Allows Path Traversal

Summary

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.

Severity

8.4 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 16:01 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-284 - Improper Access Control

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/Gitlawb/openclaude/security/ad…	x_refsource_CONFIRM
https://github.com/Gitlawb/openclaude/commit/7002…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
Gitlawb	openclaude	Affected: < 0.5.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-35570

Vulnerability from fkie_nvd - Published: 2026-04-21 00:16 - Updated: 2026-06-17 10:40

Severity

8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/Gitlawb/openclaude/commit/7002cb302b78ea2a19da3f26226de24e2903fa1d	Patch
security-advisories@github.com	https://github.com/Gitlawb/openclaude/security/advisories/GHSA-m6rx-7pvw-2f73	Exploit, Mitigation, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Gitlawb/openclaude/security/advisories/GHSA-m6rx-7pvw-2f73	Exploit, Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	gitlawb	openclaude	*

JSON

To clipboard

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GHSA-M6RX-7PVW-2F73

Vulnerability from github – Published: 2026-04-21 15:16 – Updated: 2026-04-21 15:16

Summary

OpenClaude: Sandbox Bypass via Early-Exit Logic Flaw Allows Path Traversal

Details

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

Enable sandbox mode: SandboxManager.isSandboxingEnabled() = true
Enable auto-allow: SandboxManager.isAutoAllowBashIfSandboxedEnabled() = true
Ensure no explicit deny rules are configured for the session
Submit a bash command with a path traversal payload: cat ../../../../../etc/passwd
Observe that the command receives behavior: allow without triggering checkPathConstraints

Recommended Fix

The sandbox auto-allow block should never short-circuit the full permission pipeline. It may suppress interactive prompts, but path constraint validation must always execute.

Option 1 — Preferred: Continue pipeline on `allow`

Only return early for deny or ask behaviors. Let allow fall through to checkPathConstraints:

if (
  SandboxManager.isSandboxingEnabled() &&
  SandboxManager.isAutoAllowBashIfSandboxedEnabled() &&
  shouldUseSandbox(input)
) {
  const sandboxAutoAllowResult = checkSandboxAutoAllow(
    input,
    appState.toolPermissionContext,
  );
  if (sandboxAutoAllowResult.behavior !== 'allow') {
    // Only block or prompt — never skip path checks on allow
    return sandboxAutoAllowResult;
  }
  // If 'allow', continue to checkPathConstraints below
}

Option 2 — Defense in depth: Run path check before returning

Run checkPathConstraints explicitly inside the sandbox block before returning:

if (sandboxAutoAllowResult.behavior !== 'passthrough') {
  const pathCheck = checkPathConstraints(input, appState.toolPermissionContext);
  if (pathCheck.behavior !== 'allow') {
    return pathCheck; // Block traversal attempts even in sandbox
  }
  return sandboxAutoAllowResult;
}

Option 3 — Minimal change: Move sandbox block after path check

Reorder the function so checkPathConstraints always runs first, and the sandbox block only handles the prompt-suppression logic afterward.

Credit: Elvin Latifli (@Rickidevs )

Severity

8.4 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@gitlawb/openclaude"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35570"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-284"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-21T15:16:16Z",
    "nvd_published_at": "2026-04-21T00:16:28Z",
    "severity": "HIGH"
  },
  "details": "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 \u2014 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.\n\n## Affected Component\n\n- **File:** `src/tools/BashTool/bashPermissions.ts`\n- **Function:** `bashToolHasPermission`\n- **Location:** ~line 1445 (sandbox auto-allow block)\n\n## Vulnerable Code Flow\n\n```\nbashToolHasPermission()\n    \u2502\n    \u251c\u2500 [~1445] Sandbox auto-allow block\n    \u2502       \u2514\u2500 No deny rule found \u2192 return ALLOW  \u26a0\ufe0f Early exit\n    \u2502\n    \u2514\u2500 [~1644] checkPathConstraints()             \u274c Never reached\n```\n\nThe 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.\n\n## Impact\n\nAny process or user operating in a sandboxed session with no explicit deny rules can:\n\n- Read arbitrary files outside the sandbox boundary (e.g., `/etc/passwd`, `/etc/shadow`, `.env` files, SSH private keys)\n- Write to arbitrary paths (subject to OS-level permissions)\n- Fully defeat the filesystem isolation that the sandbox is intended to enforce\n\n## Steps to Reproduce\n\n1. Enable sandbox mode: `SandboxManager.isSandboxingEnabled() = true`\n2. Enable auto-allow: `SandboxManager.isAutoAllowBashIfSandboxedEnabled() = true`\n3. Ensure no explicit deny rules are configured for the session\n4. Submit a bash command with a path traversal payload:\n   ```\n   cat ../../../../../etc/passwd\n   ```\n5. Observe that the command receives `behavior: allow` without triggering `checkPathConstraints`\n\n## Recommended Fix\n\nThe sandbox auto-allow block should **never short-circuit the full permission pipeline**. It may suppress interactive prompts, but path constraint validation must always execute.\n\n### Option 1 \u2014 Preferred: Continue pipeline on `allow`\n\nOnly return early for `deny` or `ask` behaviors. Let `allow` fall through to `checkPathConstraints`:\n\n```typescript\nif (\n  SandboxManager.isSandboxingEnabled() \u0026\u0026\n  SandboxManager.isAutoAllowBashIfSandboxedEnabled() \u0026\u0026\n  shouldUseSandbox(input)\n) {\n  const sandboxAutoAllowResult = checkSandboxAutoAllow(\n    input,\n    appState.toolPermissionContext,\n  );\n  if (sandboxAutoAllowResult.behavior !== \u0027allow\u0027) {\n    // Only block or prompt \u2014 never skip path checks on allow\n    return sandboxAutoAllowResult;\n  }\n  // If \u0027allow\u0027, continue to checkPathConstraints below\n}\n```\n\n### Option 2 \u2014 Defense in depth: Run path check before returning\n\nRun `checkPathConstraints` explicitly inside the sandbox block before returning:\n\n```typescript\nif (sandboxAutoAllowResult.behavior !== \u0027passthrough\u0027) {\n  const pathCheck = checkPathConstraints(input, appState.toolPermissionContext);\n  if (pathCheck.behavior !== \u0027allow\u0027) {\n    return pathCheck; // Block traversal attempts even in sandbox\n  }\n  return sandboxAutoAllowResult;\n}\n```\n\n### Option 3 \u2014 Minimal change: Move sandbox block after path check\n\nReorder the function so `checkPathConstraints` always runs first, and the sandbox block only handles the prompt-suppression logic afterward.\n\n---\n\nCredit: Elvin Latifli (@Rickidevs )",
  "id": "GHSA-m6rx-7pvw-2f73",
  "modified": "2026-04-21T15:16:16Z",
  "published": "2026-04-21T15:16:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Gitlawb/openclaude/security/advisories/GHSA-m6rx-7pvw-2f73"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35570"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Gitlawb/openclaude/commit/7002cb302b78ea2a19da3f26226de24e2903fa1d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Gitlawb/openclaude"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenClaude: Sandbox Bypass via Early-Exit Logic Flaw Allows Path Traversal "
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-35570 (GCVE-0-2026-35570)

FKIE_CVE-2026-35570

GHSA-M6RX-7PVW-2F73

Affected Component

Vulnerable Code Flow

Impact

Steps to Reproduce

Recommended Fix

Option 1 — Preferred: Continue pipeline on allow

Option 2 — Defense in depth: Run path check before returning

Option 3 — Minimal change: Move sandbox block after path check

Tags

Sightings

Nomenclature

Related by attack behaviour

Option 1 — Preferred: Continue pipeline on `allow`