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+# PoC: compute_numel() Integer Overflow on MSVC (Windows) Builds
+
+**Vulnerability:** `c10/core/TensorImpl.h:2596-2604` — `compute_numel()` uses the unsafe `multiply_integers()` path on MSVC builds because `C10_HAS_BUILTIN_OVERFLOW()` is unconditionally 0 on MSVC (`safe_numerics.h:9-10`). This disables overflow detection for all Windows PyTorch users.
+
+## Files
+
+- `poc_numel_msvc_overflow.py` — Full PoC (crafted model + UBSan-confirmed overflow)
+- `test_msvc_overflow.cpp` — Standalone C++ UBSan test
+- `numel_overflow_model.pt` — Crafted model with overflow dimensions
+
+## Quick Start
+
+```bash
+pip install torch
+python poc_numel_msvc_overflow.py
+```
+
+## Expected Output
+
+- GCC/Clang: `safe_compute_numel()` catches overflow (RuntimeError)
+- MSVC path: `multiply_integers()` silently overflows (UBSan confirmed)