[BUG] VSCode extension v2.1.145 — claude.exe crashes with 0xC0000409 (BEX64) at deterministic offset 0x3bd3179

Preflight Checklist

• [x] Searched existing issues — related but distinct from #40199 (v2.1.86, /insights) and #62151 (v2.1.150 desktop, conhost.exe). This is the VSCode-extension claude.exe case on v2.1.145.
• [x] Single bug report
• [x] Using auto-updated latest version (v2.1.145 at time of crash)

What's Wrong?

Claude Code VSCode native extension v2.1.145 crashes with exit code 3221226505 (0xC0000409 STATUS_STACK_BUFFER_OVERRUN / BEX64). The faulting module is claude.exe itself, not a dependency, and the fault offset is identical across all observed crashes, indicating a deterministic code path.

Environment

• Claude Code: 2.1.145.0 (VSCode native extension)
• Path: c:\Users\sunq8\.vscode\extensions\anthropic.claude-code-2.1.145-win32-x64\resources\native-binary\claude.exe
• OS: Windows 11 Home 10.0.26200

Crash Signature

Three crashes within ~10 hours, identical fault offset:

Event Name : BEX64
Faulting app : claude.exe v2.1.145.0
Faulting mod : claude.exe v2.1.145.0      (self)
Exception    : 0xc0000409 (STATUS_STACK_BUFFER_OVERRUN)
Fault offset : 0x0000000003bd3179         (identical across 3 crashes)
Times (KST)  : 2026-05-25 12:44, 19:04, 22:37

Last Application Error (Event ID 1000):

Faulting application name: claude.exe, version: 2.1.145.0, time stamp: 0x6a066cbe
Faulting module name:      claude.exe, version: 2.1.145.0, time stamp: 0x6a066cbe
Exception code: 0xc0000409
Fault offset:   0x0000000003bd3179
Faulting process id: 0x11964

The identical offset is the key signal — this is not a random heap/race issue. Symbolizing 0x3bd3179 against the v2.1.145 build should point directly at the offending function.

Steps to Reproduce

No reliable user-side repro yet — crash surfaces during normal VSCode extension use. What is consistent:

• Always v2.1.145 native binary
• Always exit code 3221226505 reported to the VSCode extension host
• Always fault offset 0x3bd3179

Expected

Extension should not crash. The VSCode panel currently shows:

Error: Claude Code process exited with code 3221226505
View output logs · Troubleshooting resources

Crash Dumps

WER archive entries available locally:

C:\ProgramData\Microsoft\Windows\WER\ReportArchive\
  AppCrash_claude.exe_d4bd4e61f86af7a343d206c1db3da3393d3c4b9_ea755167_*\

Can attach .dmp on request.

Claude Code Version

2.1.145

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VSCode native extension