[BUG] Segmentation fault at address 0x113 on Windows - Bun v1.4.0 crashes on every command

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?

Claude Code crashes immediately with a segmentation fault on every command (claude, claude login, claude --version) on Windows. The process panics during a panic and aborts. The issue persists after clean uninstall and reinstall.

What Should Happen?

Claude Code should launch and respond to commands normally.

Error Messages/Logs

Bun v1.4.0 (63bb0ca0d) Windows x64 (baseline)
Windows v10.26100
CPU: sse42 avx avx2
Args: "C:\NVM\currentNodeJS\node_modules\@anthropic-ai\claude-code\bin\claude.exe"

panic(main thread): Segmentation fault at address 0x113
oh no: Bun has crashed. This indicates a bug in Bun, not your code.
https://bun.report/1.4.0/e_163bb0camggggEugogCCWctiuser.dllgyngBCWctiuser.dllo68fCYKERNEL32.DLLs2+JCcKERNELBASE.dllqm2hBCcKERNELBASE.dllsj3gBCYKERNEL32.DLLoijPCWctiuser.dllu3ueoyt+vB4zr8f6t8mXmh2mX_A2AmR
panic: Segmentation fault at address 0x113
panicked during a panic. Aborting.

Steps to Reproduce

1. Install Claude Code globally: npm install -g @anthropic-ai/claude-code@latest
2. Open PowerShell or VS Code terminal on Windows
3. Run any claude command: claude, claude login, or claude --version
4. Process immediately crashes with segfault at address 0x113

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.196 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Environment:

• OS: Windows 10 (Build 26100)
• Claude Code version: latest (still ships Bun v1.4.0 build 63bb0ca0d)
• Node version: managed via NVM for Windows
• Install path: C:\NVM\currentNodeJS\node_modules\@anthropic-ai\claude-code\
• Shell: PowerShell
• CPU: x64 with SSE4.2, AVX, AVX2