OpenClaw Claude Bridge — Sandbox bypass allows arbitrary tool execution in spawned subprocesses (CVE-2026-39398)
OpenClaw Claude Bridge — Sandbox bypass allows arbitrary tool execution in spawned subprocesses (CVE-2026-39398)
AI relevance: This vulnerability affects the security boundary between Claude AI agents and OpenClaw tool execution, demonstrating how sandbox bypass flaws in AI agent tooling can lead to unauthorized system access when processing potentially malicious prompts.
CVE-2026-39398 discloses a critical sandbox bypass vulnerability in the openclaw-claude-bridge npm package that allows attackers to circumvent intended tool restrictions and potentially execute arbitrary commands in the gateway's process context, with a CVSS base score of 7.5 (High severity).
Key Findings
- CVE-2026-39398: Sandbox bypass vulnerability in openclaw-claude-bridge npm package
- CVSS 7.5: High severity rating due to potential arbitrary command execution
- Affected versions: All versions prior to 1.1.1
- Root cause:
--allowed-tools ""flag fails to properly restrict CLI tool access - Impact: Spawned subprocesses retain access to all CLI tools (Read/Write/Bash/WebFetch)
- Fix: Upgrade to openclaw-claude-bridge version 1.1.1 or later
Why This Matters
This vulnerability creates a false sense of security for operators deploying OpenClaw Claude bridge in environments that process untrusted prompts. The README explicitly claims sandbox protection that the code doesn't actually provide, potentially exposing systems to prompt injection attacks that could trigger arbitrary file operations, command execution, or data exfiltration.
What To Do
- Immediate action: Upgrade openclaw-claude-bridge to version 1.1.1 or later
- Audit deployments: Review any OpenClaw instances using the Claude bridge with untrusted input sources
- Assume compromise: If deployed behind public interfaces, assume potential unauthorized tool access occurred
- Monitor subprocesses: Implement additional monitoring for spawned CLI tool executions
- Defense in depth: Layer additional security controls beyond the bridge's sandbox claims