[BUG] Claude Code can't start in a directory whose name has a newline character

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Tested on both Linux and macOS, TL;DR:

$ claude --version
2.1.140 (Claude Code)

$ mkdir 'a\nb' && cd a\\nb

$ claude

This freeze Claude Code and it never starts.

What Should Happen?

Claude Code should open as usual.

Error Messages/Logs

There is no output, Claude just freezes.

Steps to Reproduce

Execute those commands in shell:

mkdir 'a\nb' && cd a\\nb
claude

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.140

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

iTerm2

Additional Information

_No response_