[BUG] Regression: Pasting text in CLI hangs and crashes (broken since 2.1.70, worked in 2.1.69)

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?

Environment:

• Claude Code version: 2.1.70
• Previous working version: 2.1.69
• OS: macOS 26.2 (Tahoe), Build 25C56, Darwin 25.2.0 arm64 (Apple Silicon)
• Terminal: VS Code integrated terminal v2.5.26
• Shell: zsh 5.9
• Node.js: v22.17.0
• npm: 10.9.2

Description:
Pasting text into the Claude Code CLI is broken since updating from 2.1.69 to 2.1.70. When pasting even a small amount of text (~5 lines), the CLI hangs for an extended period and then crashes. This was fully functional on 2.1.69.

Actual behavior:
Pasting even small amounts of text (~5 lines) causes the CLI to hang indefinitely, followed by a crash.

What Should Happen?

Expected behavior:
Text pastes instantly and Claude processes it normally (as it did in 2.1.69).

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

1. Open Claude Code 2.1.70 in VS Code integrated terminal on macOS
2. Copy ~5 lines of text to clipboard
3. Paste into the Claude Code CLI input
4. Observe: input hangs/freezes for a long time
5. Eventually Claude crashes

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.69

Claude Code Version

2.1.70

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_