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CoreML Span::Slice Integer Overflow PoC

This repository contains a crafted CoreML weight file (.wt) that triggers an integer overflow vulnerability in the MILBlob Span::Slice() bounds check in coremltools.

Files

malicious_weight.wt - Crafted weight file (256 bytes) that causes OOB read / crash

Vulnerability

The blob_metadata in the weight file contains:

offset = 128 (valid position)
sizeInBytes = 0xFFFFFFFFFFFFFF80 (UINT64_MAX - 127)

When loaded by StorageReader, Span::Slice(128, 0xFFFFFFFFFFFFFF80) is called. The bounds check 128 + 0xFFFFFFFFFFFFFF80 = 0 (overflow!) <= 256 passes, creating an 18 EB Span.

Accessing data beyond the mmap'd file region causes SIGSEGV.

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