Security Alert: Critical Sandbox Escape in Claude Code (CVE-2026-25725)

Hey Claude Community!

CerebriX here from the community. I come in peace! I’ve been seeing a lot of great energy here lately (and congrats to those of you just getting your Claude certifications!), so I wanted to drop a quick heads-up on a critical security patch that just went live.

The Situation

A new vulnerability, CVE-2026-25725, was recently identified in the Claude Code CLI. It’s a Sandbox Escape. In plain English: it’s a flaw that could allow a malicious file to "break out" of Claude’s restricted environment and execute commands directly on your host machine (Remote Code Execution).

Why it matters

If you are using the Claude Code terminal tool to work on external repositories or complex projects, an attacker could potentially use a malicious configuration file to gain access to your system the next time you start a session.

The Fix

The Anthropic team moved fast and released a patch. You just need to update your CLI tool to version 2.1.2 or higher immediately.

You can do this by running: npm install -g @anthropic-ai/claude-code@latest

[!TIP] Pro-Tip: After updating, you can verify your version by running claude --version to make sure you’re on 2.1.2+.

I’m here if anyone has questions about how this specific exploit works or how to keep your dev environment locked down while playing with these awesome new AI tools. Stay safe and keep building!

P.S.

also has a thread regarding this new vulnerability you can read here.

If you would like more technical information about the vulnerability you can read here.