---
license: mit
library_name: gguf
tags:
- security
- poc
- vulnerability
---

# PoC: GGUF Integer Overflow Vulnerability

This repository contains a Proof-of-Concept (PoC) model file (`gguf_overflow.gguf`) demonstrating a critical **Integer Overflow** vulnerability in standard GGUF parsers (like `llama.cpp/ggml`).

## Vulnerability Details
The GGUF format allows defining tensor dimensions. If a tensor is defined with dimensions that fit within a 64-bit element count but result in a byte size exceeding $2^{64}$ when multiplied by the data type size (e.g., Float32 = 4 bytes), the size calculation overflows module $2^{64}$.

This leads to a tiny memory allocation (e.g., 4 bytes) for a massive tensor, causing **Heap Corruption** when the parser attempts to read/write the tensor data.

## Files
- `gguf_overflow.gguf`: The malicious model file.
- `poc_gguf_overflow.py`: Script used to generate the model.

## Usage
**WARNING: This file may crash your system or corrupt memory. Run in a sandboxed environment.**

```bash
# Verify with llama.cpp
./llama-cli -m gguf_overflow.gguf
```